Republic of the Philippines
Department of Education
Regional Office IX, Zamboanga Peninsula
7
SCIENCE
Quarter 3 - Module 6
HEAT TRANSFER
Name of Learner: ___________________________
Grade & Section: ___________________________
Name of School:
___________________________
Science – Grade 7
Support Material for Independent Learning Engagement (SMILE)
Quarter 1 – Module 1: Heat Transfer
First Edition, 2021
Republic Act 8293, section 176 states that: No copyright shall subsist in any work of
the Government of the Philippines. However, prior approval of the government agency or office
wherein the work is created shall be necessary for the exploitation of such work for a profit.
Such agency or office may, among other things, impose as a condition the payment of
royalties.
Borrowed materials (i.e., songs, stories, poems, pictures, photos, brand names,
trademarks, etc.) included in this module are owned by their respective copyright holders.
Every effort has been exerted to locate and seek permission to use these materials from their
respective copyright owners. The publisher and authors do not represent nor claim ownership
over them.
Development Team of the Module
Writer:
Winchel C. Bere
Editors:
Evelyn G. Zamoras, Joel P. Ogoc
Reviewers:
Evelyn G. Zamoras, Charmalou P. Ogarte
Layout Artist:
Chris Raymund M. Bermudo
Management Team: Virgilio P. Batan Jr.
Lourma I. Poculan
- Schools Division Superintendent
- Asst. Schools Division Superintendent
Amelinda D. Montero - Chief Education Supervisor, CID
Nur N. Hussien
- Chief Education Supervisor, SGOD
Ronillo S. Yarag
- Education Program Supervisor, LRMS
Zyhrine P. Mayormita - Education Program Supervisor, Science
Leo Martinno O. Alejo - Project Development Officer II, LRMS
Arsenia C. Zamoras - Public Schools Division Superintendent
Joselito S. Tizon
- School Principal, Galas NHS
Printed in the Philippines by
Department of Education – Region IX – Dipolog City Schools Division
Office Address:
Telefax:
E-mail Address:
Purok Farmers, Olingan, Dipolog City
Zamboanga del Norte, 7100
(065) 212-6986 and (065) 212-5818
dipolog.city@deped.gov.ph
What I Need to Know
For sure, you have used the word 'heat' many times in your life. You
have experienced it, and you have observed its effects. But have you ever
wondered what heat really is?
This module aims to reinforce your understanding of heat as energy
that transfers from one object or place to another. You will determine the
conditions necessary for heat transfer and the direction by which heat
transfers by examining the changes in the temperature of the objects involved.
You will also observe the different methods of heat transfer and investigate
some factors that affect these methods.
This module was designed and written in a way that suits your
understanding and needs. It is here to help you master heat transfer
concepts and infer the conditions necessary for heat transfer to occur.
(MELC S7LT-IIIh-i-12)
Specific Objectives:
a. Identify the basic forms of heat transfer.
b. Describe the basic forms of heat transfer.
What's In
In Grade 6, you learned to demonstrate the transformation of sound,
heat, light, and electricity. You also learned that heat moves from the source
to other objects or places. Let us do a self-test. Read on and answer the
activity.
Activity 1: Energy from the Past
Directions: Complete the term for the defined science concept.
Concept
Science Term
1. Energy in transit from a body of a higher 1.H __A __
temperature to a body of lower
temperature.
2. Energy an object possesses due to the
2.TH__R__AL E__ER__Y
movement of particles within the object.
(2 words)
3. Measure of the hotness or coldness of a
3.TEM__ __R__T__RE
body and related to the average kinetic
energy of atoms and molecules in a
system.
1
4. Having a low temperature.
5. Having a high temperature.
6. An instrument used for measuring
temperature.
4.C__L __
5.__O__
6.THE__MO__ __T__R
What's New
Activity 2: The Search is On
Directions: Find the words related to heat transfer listed in the word search
puzzle below by encircling it. The words may be written horizontally, vertically,
or diagonally.
HEAT TRANSFER WORD SEARCH
H H
I
N
S
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A
T
O R
E
J
K H
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T W X
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B D
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1.
2.
3.
4.
HEAT
CONDUCTION
CONVECTION
RADIATION
5. COLDNESS
6. TEMPERATURE
7. HOTNESS
8. THERMAL ENERGY
9. THERMOMETER
10.CONDUCT
2
11. INSULATOR
What is It
Have you heard of the term thermal energy before? Objects possess
thermal energy due to the movement of their particles. Like any form of
energy, it can be transformed into other forms or transferred to other objects
or places. Heat, another form of energy, refers to thermal energy 'in transit'
or in the process of being transferred. It stops becoming heat when the
transfer stops.
Heat transfer is a phenomenon related to a change in temperature or
a change in the relative hotness or coldness of an object. Energy transfers
naturally flow from a body of higher temperature to a body of lower
temperature. There are three basic forms of heat transfer, namely radiation,
conduction, and convection.
Radiation
In Figure 1, the heat from
the sun travels by waves
through space towards the
Earth, which will absorb the
heat, so the Earth becomes
warm. This process is called
radiation. It is the transfer of
Figure 1. The sun radiates heat towards the Earth heat in rays, from a hot object,
without needing a medium to
pass through. It travels in all directions from a hot object. The hotter an object
is, the more heat it will radiate out. Radiation travels in a straight line and
can travel in a vacuum. It does not need particles for it to travel.
Conduction
The particles or molecules of
substances in the solid state are
very close to each other. As the
molecules in one part of a solid are
heated, the heat travels to the
nearest object. These molecules, in
turn, transfer the heat to the next
molecules. This process is called
conduction. The transfer of heat is
Figure 2. Metal spoon left in a pan of soup
through direct contact. It occurs
anytime when objects of different
temperatures touch each other. As long as the objects are in contact, the
transfer of heat will continue until the temperature of the objects equalizes or
are the same. This is observed in Figure 2, where a metal spoon is left in a
pan of soup that is heating on the stove. The spoon is in direct contact with
the hot soup, and heat is transferred to the spoon.
3
Radiation
Another method of heat transfer is observed
when heating water, as illustrated in Figure 3.
The water at the bottom part of the container
gets heated first. When water is heated, it begins
to rise. Cold water is heavier than warm water.
As warm water rises, cold water goes down. The
process is repeated until all the water has the
same temperature. This process is called
convection. Convection happens depending on
the density of the material. For example, when
Figure 3. Convection
particles in the air spread out, they become less
dense and generally rise above the unheated, denser particles around them.
The denser masses of the gas or liquid move in to fill the space left by the
heated particles. The particles that move away from the source of heat become
cooler and denser.
Convection Current
The movement of air due to
heat is called a convection
current. Convection currents
rely on the constant cyclical
motion of air, water, and
other
substances
to
distribute heat. As heated air
rises, it pulls cooler air into
its place - where the latter
can be heated, then rises and
pulls in more cool air.
Figure 4. Convection Current
Figure 5. Summary of Heat Transfer
4
What's More
Activity 3: Warm Me Up, Cool Me Down!
Direction: Perform the activity using your sense of touch. You can use your fingers
or hands to feel the objects being observed. In this activity, you will describe the
condition necessary for heat transfer to take place and trace the direction in which
heat is transferred. Precaution: Be extra careful when using hot water.
Materials Needed:
 2 small drinking cups (glasses) as containers
 2 big containers (enough to accommodate the small containers)
 tap water
 hot water
Procedure:
1. Label the plastic cups 1 and 2 while
the big ice cream tubs A and B as
shown.
2. Half fill containers 1, 2, and A with
tap water while half fill container B
with hot water. Be careful when
you pour hot water into the
container.
3. Carefully place plastic cup 1 inside
tub A in Setup 1. Do the same with
plastic cup 2 and tub B as in Setup
2.
4. After some time, dip your fingers for
a while into plastic cups 1 and 2
and observe the relative temperature.
Activity Questions:
Q1. In which setup was there a change in the temperature of water in the plastic
cup? In which setup was there NO change in the temperature of the water inside
the containers?
________________________________________________________________________________
Q2. In which setup is heat transfer taking place between water in the plastic
cup and the water in the ice cream tub?
________________________________________________________________________________
Q3. Based on your observation, what condition is needed for heat transfer to take
place between objects?
________________________________________________________________________________
5
Q4. If heat is related to temperature, what then is the direction of the heat that
transfers between the containers?
________________________________________________________________________________
Q5. What do you think will happen to the temperature of water in each container
after 4, 6, 8, and 10 minutes? What does this tell us about the heat transfer
taking place between the containers?
________________________________________________________________________________
Q6. Until when do you think heat transfer will continue to take place between the
containers?
____________________________________________________________________________
The next activities will allow you to explore that heat travels by conduction
from hot to cool object, that heat travels by convection through liquid and gas, and
that heat travels by radiation through a gas. Precaution: Be careful when
dealing with fire.
Activity 4: Methods of Heat Transfer
Procedure 1:
1. Prepare a spoon, a small piece of cloth, a
candle, and matches.
2. Light the candle, then with a piece of cloth,
hold a spoon over the flame for five minutes.
1
Q1. What happens to the handle of the spoon?
What method of heat transfer takes place?
____________________________________________
____________________________________________
Procedure 2:
1. Prepare a glass jar that can withstand
heating, water, blue dye, and matches.
2. Half fill the glass jar with water and add
a pinch of blue dye into it.
3. Heat the water over a slow fire on a stove
and observe what happens. Please work
with an adult.
2
Q2.What happens to the movement of the red dye when the water starts
to boil? What method of heat transfer takes place?
__________________________________________________________________________________________
6
Procedure 3:
1. Make a fire in an open ground.
2. Sit near the fire. Feel your face and
arms.
3
Q3. What do you feel? How did the heat
from the fire transfer to your face?
__________________________________________
__________________________________________
What I Have Learned
Activity 5: Transfer of Learning
Direction: A. Identify the method of heat transfer described in each
situation below. Write conduction, convection, or radiation on the space
provided before the number.
________________1. Roy’s fingers getting warm while holding a hot fork.
________________2. The ground’s hot surface heats the air above it.
________________3. A hair blower drying your wet hair.
________________4. Left in a bowl of hot soup, a ladle gets hot after 3
minutes.
________________5. Alea Mae’s face and arms getting warm as she walks
under the sun.
B. When cooking pancakes, explain how heat travels from the fire to the
frying pan, then the cooking oil, the batter, and the cooked pancakes.
______________________________________________________________
_____________________________________________________________
What I Can Do
Activity 6: All At Once!
Direction: In the previous activities, you learned that heat could transfer
in various ways as objects reflect, absorb and transmit heat. It is time to
make use of what you have learned about heat and heat transfer.
Task 1:
Look at each illustration given. It shows situations that involve heat
transfer. Identify three situations found in the illustration that involve the
7
different methods of heat transfer. Circle the situation in the illustration and
label it 1, 2, and 3 with the corresponding method.
Situations:
1._____________________
2._____________________
3._____________________
Task 2
Note that in your chosen situations, there could be more than one
heat transfer activity taking place at the same time. Let us examine each
situation you chose by filling up Table 1.
Situation
The object
that gives off
heat
The object
that receives
heat
Method of heat
transfer taking
place
1
2
3
Assessment
Direction: Write the letter of the best answer in the space provided.
_____1. Heat transfers from an area of ______temperature to an area of
______temperature.
A. low; low
C. high; high
B. low; high
D. high; low
For questions No. 2 to 4, use the following choices:
A. Radiation
B. Conduction
C. Convection
D. Condensation
_____2. All of the following are basic forms of heat transfer EXCEPT _____.
8
_____3. Frying a fish is an example of which type of heat transfer?
_____4. When warm ocean water meets the cold ocean water, which type of
heat transfer occurs?
_____5. Which of the following is NOT a radiation method of heat transfer?
A. baking in a metal pan in an oven
B. microwaving a food
C. the heat from a fire
D. sun rays
_____6. All of the following are examples of conduction EXCEPT _____.
A. ice cooling down your hand
B. touching a stove and being burned
C. the heat from the sun warming your face
D. boiling water by thrusting a red-hot piece of iron into it
_____7. When a metal spoon with a temperature of 25°C is placed in a cup of
hot water with a temperature of 95°C, how is the temperature of the two
objects affected by the contact?
A. The temperature of the spoon decreases; for hot water, it
increases
B. The temperature of the spoon increases; for hot water, it decrease
C. The temperature of the spoon increases; for hot water, it is
unaffected
D. The temperature of the spoon is unaffected; for hot water, it
decreases
_____8. Why does conduction occur between objects?
A. Objects in contact must have different temperatures.
B. Objects in contact must have the same temperature.
C. Objects not in contact must have different temperatures.
D. Objects not in contact must have the same temperature.
_____9. The tourist suite of passenger ship is air-conditioned, and your mom
wants you to choose between the upper deck bed and lower deck bed. How
will your knowledge of convection help you decide so that you can maximize
the cool temperature?
A. Warm air goes down; thus, you choose the upper deck bed
B. Cool air goes down; thus, you avoid the lower deck bed
C. Cool air rises; thus, you choose the upper deck bed
D. Warm air rises; thus, you avoid the upper deck bed
____10. Despite the sun's distance from the Earth, it is still able to keep the
Earth warm. Why is this possible?
A. The sun warms the particles nearest it creating convection
currents
B. The sun's heat is transferred through the electromagnetic waves
C. The sun conducts heats using the plants by photosynthesis
D. The sun condenses water vapor in the clouds as rain
9
Additional Activities
Activity 7: Feel the Heat
Direction: Identify the type of heat transfer that is described in the statement
and illustrations below. Write your answer in the space provided before the
number.
1. Warm air rises and the cool air sinks
________________________________
2. Barefoot walking on a rocky road
________________________________
3. Feeling the heat of the metal in your
hand
________________________________
4. Getting those bread toasted for breakfast
________________________________
5. Heat from a bonfire warms your body
________________________________
10
Answer Key Gr7Q3 Module 6
What's In
1.
2.
3.
4.
5.
6.
Heat
Thermal Energy
Temperature
Cold
Hot
Thermometer
What's New
H
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B
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HEAT TRANSFER WORD SEARCH
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What's More
Activity 3
1. Setup 2, Setup 1
2. Setup 2
3. For heat transfer to take place, the objects must be of different temperatures.
4. Heat is transferred from Container B to container 2. - Heat is transferred from
an object of higher temperature to an object of lower temperature. - Heat is
transferred from a warmer object to a cooler object.
5. In container 2, the temperature of water continuously increases while the
temperature of water in container B continuously decreases. Heat transfer is
continuously taking place between the containers
6. Heat transfer will continue to take place until both objects reach the same
temperature (just like in Setup1)
Activity 4
1. The handle of the spoon becomes hot. Conduction
2. The red dye itself goes up. Convection
3. I feel warm. The heat transfer due to its radiation.
What I Have Learned
Activity 5
A. 1. Conduction
2. Convection
3. Convection
4. Conduction
5. Radiation
11
B. In cooking, the stove burners conduct heat energy to the bottom of a frying
pan sitting on top of it. From there, the pan conducts heat to its contents. A frying
pan also uses conduction heating as the hot oil cooks the pancake when it comes in direct
contact with it.
What I Can Do
Activity 6
Task 1 [Are these the only possible answers? If there are more, then
enumerate it here, indicating: Answers may vary, but these are possible
answers]
1. melting ice cream
3. steam coming from a kettle while the water is
boiling
2. broiling fish
Task 2
Sample Answers [Are these the only possible answers? If there are more,
then enumerate it here, indicating: Answers may vary, but these are possible
answers]
Description
Which
Which
What method of heat
object
object
transfer takes place?
gives off
receives
heat?
heat?
1 melting ice cream
sun
ice cream
radiation
2 broiling fish
flame
fish
conduction/convection
3 steam coming from a
boiling
air above
convection
kettle while the water is water
boiling
Assessment
1. D
2. D
3. B
4. B
5. A
6. C
7. B
8. A
9. D
10. B
Additional Activities
1.
2.
3.
4.
5.
Convection
Conduction
Conduction
Convection
Radiation
12
References
http://www.lrmds.depedldn.com/Downloads/Methods of Heat Transfer
https://www.physicsclassroom.com/class/thermalP/Lesson1/Temperature-and-Thermometers
file:///C:/Users/W/Downloads/EASE-Physics-Module-13-Transit-Energies.
Department of Education (2013).Science – Grade 7 Learner's Material. First
Edition.
Department of Education (2013).Science – Grade 7 Teachers Guide. First
Edition.
https://physics.stackexchange.com/questions/62423/example-ofsituation-with-conduction-convection-and-radiation
https://www.webstaurantstore.com/blog/postdetails.cfm?post=976
Creators first and last name, Title of Work, date, medium, dimensions,
location, or collection (publication details in brackets for footnotes), date
accessed and URL. Images do not usually appear in the bibliography, only
the notes.
Campfire Cartoon. png. January 10, 2021. favpng.com
Barefoot walking:how to do it safely without injury. png. January 10, 2021.
Prevention.com
Simple heat conduction experiment. png. January 10, 2021. Wikihow.com
Bread toaster 2 slice toaster with warmin rack. Png. January 10, 2021.
https://productnation.co/ph/product/toaster-2-slice-toaster-withwarming-rack
Rayleigh-Benard convection. Png. January 20, 2021.
https://www.mis.mpg.de/applan/research/rayleigh.html
13
Region IX: Zamboanga Peninsula Hymn – Our Eden Land
Here the trees and flowers bloom
Here the breezes gently Blow,
Here the birds sing Merrily,
The liberty forever Stays,
Gallant men And Ladies fair
Linger with love and care
Golden beams of sunrise and sunset
Are visions you’ll never forget
Oh! That’s Region IX
Here the Badjaos roam the seas
Here the Samals live in peace
Here the Tausogs thrive so free
With the Yakans in unity
Hardworking people Abound,
Every valleys and Dale
Zamboangueños, Tagalogs, Bicolanos,
Cebuanos, Ilocanos, Subanons, Boholanos, Ilongos,
All of them are proud and true
Region IX our Eden Land
Region IX
Our..
Eden...
Land...
My Final Farewell
Farewell, dear Fatherland, clime of the sun caress'd
Pearl of the Orient seas, our Eden lost!,
Gladly now I go to give thee this faded life's best,
And were it brighter, fresher, or more blest
Still would I give it thee, nor count the cost.
Let the sun draw the vapors up to the sky,
And heavenward in purity bear my tardy protest
Let some kind soul o 'er my untimely fate sigh,
And in the still evening a prayer be lifted on high
From thee, 0 my country, that in God I may rest.
On the field of battle, 'mid the frenzy of fight,
Others have given their lives, without doubt or heed;
The place matters not-cypress or laurel or lily white,
Scaffold or open plain, combat or martyrdom's plight,
T is ever the same, to serve our home and country's need.
Pray for all those that hapless have died,
For all who have suffered the unmeasur'd pain;
For our mothers that bitterly their woes have cried,
For widows and orphans, for captives by torture tried
And then for thyself that redemption thou mayst gain
I die just when I see the dawn break,
Through the gloom of night, to herald the day;
And if color is lacking my blood thou shalt take,
Pour'd out at need for thy dear sake
To dye with its crimson the waking ray.
An d when t he d ar k night wr a p s t he gr av eyar d ar o un d
Wit h only t he de a d in t heir v igil t o se e
Br ea k n ot my r e p os e or t he m yst er y pr of o un d
An d p er ch anc e t ho u m ayst he ar a sa d hy mn r es o un d
'T i s I, O m y c ou nt r y, r aising a s ong unt o t hee.
My dreams, when life first opened to me,
My dreams, when the hopes of youth beat high,
Were to see thy lov'd face, O gem of the Orient sea
From gloom and grief, from care and sorrow free;
No blush on thy brow, no tear in thine eye.
An d ev en my gr av e i s r em em ber ed n o m or e
Unmar k' d by nev er a cr os s nor a st on e
Let t he pl ow sw ee p t hr o ugh it , t he s p ad e t ur n it o 'er
That m y ash es m ay c ar p et ear t hly f l oor ,
Bef or e int o not hi ngne ss at l ast t hey ar e bl own.
Dream of my life, my living and burning desire,
All hail ! cries the soul that is now to take flight;
All hail ! And sweet it is for thee to expire ;
To die for thy sake, that thou mayst aspire;
And sleep in thy bosom eternity's long night.
The n will o bliv i on br in g t o m e no car e
As ov er t hy v ales an d plai ns I swe ep;
Thr o b bing an d cle ans e d in t hy s pac e an d air
Wit h col or an d light , wit h s ong an d l ame nt I f ar e,
Ev er r e pe at ing t he f ait h t h at I ke ep.
If over my grave some day thou seest grow,
In the grassy sod, a humble flower,
Draw it to thy lips and kiss my soul so,
While I may feel on my brow in the cold tomb below
The touch of thy tenderness, thy breath's warm power.
My F at her lan d a d or ' d, t hat s adn es s t o m y s or r ow le n ds
Bel ov e d Fili pin as, h ear no w my la st go o d - by!
I giv e t hee all: par ent s an d kin dr e d an d f r ien ds
For I g o wher e no slav e bef or e t he op pr ess or ben ds,
Wher e f ait h c an nev er k ill, an d G o d r eign s e' er on hi gh!
Let the moon beam over me soft and serene,
Let the dawn shed over me its radiant flashes,
Let the wind with sad lament over me keen ;
And if on my cross a bird should be seen,
Let it trill there its hymn of peace to my ashes.
Far ew ell t o y o u all, f r o m my s o ul t or n a way,
Fr ien ds of my chi ldh o o d in t he h om e di s po ss es se d!
Giv e t han ks t hat I r est f r om t h e wear i so me da y!
Far ew ell t o t hee, t o o, swe et f r ien d t hat lig ht ene d my way;
Bel ov e d cr e at ur es al l, f ar ewell ! In d e at h t her e is r est !
I Am a Filipino, by Carlos P. Romulo
I am a Filipino–inheritor of a glorious past, hostage to the uncertain
future. As such I must prove equal to a two-fold task–the task of
meeting my responsibility to the past, and the task of performing
my obligation to the future.
I sprung from a hardy race, child many generations removed of
ancient Malayan pioneers. Across the centuries the memory comes
rushing back to me: of brown-skinned men putting out to sea in
ships that were as frail as their hearts were stout. Over the sea I see
them come, borne upon the billowing wave and the whistling wind,
carried upon the mighty swell of hope–hope in the free abundance
of new land that was to be their home and their children’s forever.
I am a Filipino. In my blood runs the immortal seed of heroes–seed
that flowered down the centuries in deeds of courage and defiance.
In my veins yet pulses the same hot blood that sent Lapulapu to
battle against the first invader of this land, that nerved Lakandula
in the combat against the alien foe, that drove Diego Silang and
Dagohoy into rebellion against the foreign oppressor.
The seed I bear within me is an immortal seed. It is the mark of my
manhood, the symbol of dignity as a human being. Like the seeds
that were once buried in the tomb of Tutankhamen many thousand
years ago, it shall grow and flower and bear fruit again. It is the
insignia of my race, and my generation is but a stage in the
unending search of my people for freedom and happiness.
I am a Filipino, child of the marriage of the East and the West. The
East, with its languor and mysticism, its passivity and endurance,
was my mother, and my sire was the West that came thundering
across the seas with the Cross and Sword and the Machine. I am of
the East, an eager participant in its spirit, and in its struggles for
liberation from the imperialist yoke. But I also know that the East
must awake from its centuried sleep, shake off the lethargy that has
bound his limbs, and start moving where destiny awaits.
I am a Filipino, and this is my inheritance. What pledge shall I give
that I may prove worthy of my inheritance? I shall give the pledge
that has come ringing down the corridors of the centuries, and it
shall be compounded of the joyous cries of my Malayan forebears
when first they saw the contours of this land loom before their eyes,
of the battle cries that have resounded in every field of combat from
Mactan to Tirad Pass, of the voices of my people when they sing:
“I am a Filipino born to freedom, and I shall not rest until freedom
shall have been added unto my inheritance—for myself and my
children and my children’s children—forever.”
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