1. Heat Energy Temperature
Made by Ms. Priya

2. Heat Energy VOCABULARY
Fahrenheit
Thermodynamic
Fundamental
Conversion
Absolute
Expansion
Contraction
Particles
Thermometer
Electromagnetic waves

3. Thermodynamics
Thermodynamics is a branch of physics concerned with heat and temperature and their relation to energy and work.

4. Temperature Temperature and heat are not the same.
Temperature is a measurement of heat.
Temperature tells whether something is hot or cold.

5. 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.

6. 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

7. 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.

8. 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

9. Kelvin The freezing point of water is 273.15 K
The Kelvin or Absolute scale of temperature
The freezing point of water is K
Boiling point is K.
The term "degree" is not used.
The abbreviation or unit is "K".

12. Temperature conversion
The formula to convert Celsius to Kelvin is:
TK = TC + 273
For example:
Convert 27° C to Kelvin.
Solution: K = °C K = K = K

13. 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

14. Temperature conversion
Example:
Convert 26° Celsius (a nice warm day) to Fahrenheit
Answer: ° × 9/5 = 234/5 = = 78.8° F

16. 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 – degrees Celsius on the Celsius scale.
Absolute zero is equal to – degrees F on the Fahrenheit scale.

17. Exercise 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 °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?

18. Exercise answers
50F
37°C
20°C
310K
30°C 86F
25°C