1. The mass of an object is 6 grams. The volume of an
object is 2 cm3. What is the object’s density?
A
A
1. Which is more dense, A or B?
B
B
2. Force pushing or pressing on an area in known as:
Lesson Essential Question:
What are the effects of each property
of air?
Go over bellringer
Vocabulary Previewing
Discuss the 3 Properties of Air
– Mass
– Density
– Pressure
2
• A force pushing on an area or
surface.
Pressure Activity
1. Fill the cup half way
with water.
2. Put on index card on
top of the cup.
3. Hold the card tightly
against the top of the
cup with one hand.
Quickly turn the cup
upside down.
4. Let go of the card.
4
Air Pressure
The weight of a column of air pushing
down on you.
2,000-3,000
pounds!
5
Why doesn’t the weight of air
pressure crush you?
Because you have an
equal amount of
air pushing back in
all directions.
http://www.phschool.com/atschool/phsciexp/active_art/measuring_ai
6
r_pressure/index.html
Heavy Air Lab
• As you hold the potato, keep your
fingers on the front and thumb on
the back and not on the top and
bottom. You don't want to stab
yourself!
• Grab the straw with your writing
hand and try to push the straw
through the potato.
• Now, cap the top end of the straw
with your thumb.
• Hold on firmly to both the straw
and the potato and with a quick,
sharp stab, drive the straw into the
spud. You're so cool!
When blowing up a balloon, where
is the air pressure higher? INSIDE
or OUTSIDE the balloon.
When letting go of an inflated balloon, in
which way does the air travel? ____
A. Air travels from high pressure areas to low pressure areas.
B. Air travels from low pressure areas to high pressure areas.
9
What tool is used to measure air
pressure?
• BAROMETER!!!!!
• 2 types:
• Mercury
• Aneroid
10
Barometers
Mercury Barometer: instrument that measures
air pressure using liquid mercury.
11
Draw a line on the glass
tube to show where the level
of mercury would go if AIR
PRESSURE FELL.
Draw a line on the glass
tube to show where the level
of mercury would go if AIR
PRESSURE ROSE.
12
Barometers
Aneroid Barometer: instrument that measures air
pressure without using a liquid.
13
Altitude
The distance above sea level.
16
Altitude Affects Air Pressure
17
Altitude Affects Air Pressure
–Imagine a stack of books, which book has
more pressure on it, the top or bottom one?
– Air near the top of the
atmosphere is like the top book,
the air has less weight pressing
on it and has a lower air
pressure.
–Air at sea level is like
the bottom book, it has
high pressure.
18
Air pressure decreases as altitude
increases.
19
20
Altitude Affects Density
Altitude and Air Density: The density of air
decreases as altitude increases.
21
Friday, March 18, 2016
Complete the
“Properties of Air”
homework.
1. 3 minutes – with table partner
2. Using the word wall to help remind you
of the vocabulary, draw a picture/doodle
of one vocab word, and attempt to have
your partner guess what you are
doodling.
24
FAIR
PIZZA
BLUE
FLOOD
SCIENCE
PUPPY
Aneroid
Barometer
Density
Atmosphere
Altitude
Oxygen
Air
Pressure
Mercury
Barometer
Mass
Weather
Barometer
Nitrogen
Pressure