HEAT ENERGY
TEMPERATURE
Made by Ms. Priya
HEAT ENERGY
VOCABULARY
Fahrenheit
2. Thermodynamic
3. Fundamental
4. Conversion
5. Absolute
6. Expansion
7. Contraction
8. Particles
9. Thermometer
10.Electromagnetic waves
1.
THERMODYNAMICS
 Thermodynamics
is a branch of physics
concerned with heat and temperature and their
relation to energy and work.
TEMPERATURE
 Temperature
and heat are not the same.
 Temperature is a measurement of heat.
 Temperature tells whether something is hot or
cold.
TEMPERATURE

The temperature of a substance is a result of the speed at
which its molecules are moving. The faster the
molecules are moving, the higher the temperature
of the substance.
There are three main temperature scales:
°F, the Fahrenheit Scale (used in the US)
 °C, the Celsius Scale (part of the Metric System, used
in most other countries)
 K , the Kelvin scale

CELSIUS
The Celsius (or centigrade) Temperature Scale
Celsius, also known as centigrade, is a scale and unit
of measurement for temperature.
Degree Celsius (°C)

0 °C as the freezing point of water at normal pressure.
 100 °C as the boiling point of water at normal pressure.

FAHRENHEIT
Fahrenheit is a thermodynamic temperature
scale, called as degree Fahrenheit (°F)
 Freezing point of water, 32°F
 Normal human body temperature, 98.6°F
Boiling water (at normal pressure) 100° in Celsius,
but 212° in Fahrenheit
water freezes at 0° in Celsius, but 32° in
Fahrenheit
KELVIN
The Kelvin or Absolute scale of
temperature
 The
freezing point of water is 273.15 K
 Boiling point is 373.15 K.
 The term "degree" is not used.
 The abbreviation or unit is "K".
TEMPERATURE CONVERSION
The formula to convert Celsius to Kelvin is:
TK = TC + 273

For example:
Convert 27° C to Kelvin.
Solution:
K = °C + 273
K = 27 + 273
K = 300
300 K
TEMPERATURE CONVERSION

The Fahrenheit to Celsius conversion equation
may be expressed in this form:
TC = 5/9(TF - 32)
Celsius to Fahrenheit
(°C × 9/5) + 32 = °F
Fahrenheit to Celsius
(°F - 32) x 5/9 = °C
TEMPERATURE CONVERSION
Example:
Convert 26° Celsius (a nice warm day) to
Fahrenheit
Answer:
26° × 9/5 = 234/5 = 46.8
46.8 + 32 = 78.8° F

ABSOLUTE ZERO
Absolute zero is the lowest possible temperature
where nothing could be colder and no heat energy
remains in a substance.
Absolute zero is 0 K on the Kelvin scale,
and –273.15 degrees Celsius on the Celsius scale.
 Absolute zero is equal to –459.67 degrees F on the
Fahrenheit scale.

EXERCISE
1.
2.
3.
4.
5.
6.
Convert 10° Celsius (A cool day) to Fahrenheit.
Convert 98.6° Fahrenheit (normal body
temperature) to Celsius.
Convert 68° Fahrenheit to Celsius.
A healthy person has a body temperature of 98.6
°F. What is this temperature in Kelvin?
If the temperature will be 303 K today, how can
you express that temperature in °C and °F?
What is the temperature in Celsius of 77 °F?
EXERCISE
50F
2. 37°C
3. 20°C
4. 310K
5. 30°C
6. 25°C
1.
86F
ANSWERS