1. Temperature
How hot is it?

2. Temperature
Temperature is a measure of the average kinetic energy of a molecule of a substance, or…
How “hot” it is.

3. On Temperature Scales, a higher number of degrees indicates that a substance’s molecules are moving faster.

4. Absolute Zero
The lowest possible temperature is when the molecules don’t move at all.
This is called Absolute Zero.

5. Celsius (aka Centigrade) Kelvin
Temperature Scales
There are currently three commonly used units of measurement for temperature:
Fahrenheit
Celsius (aka Centigrade)
Kelvin

6. Fahrenheit
There are only 5 countries that still use Fahrenheit as an everyday unit of measurement for temperature: The Bahamas, Belize, the Cayman Islands, Palau, and the United States and associated territories.

7. On the Fahrenheit scale, the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point is 212 °F (at standard atmospheric pressure).

8. Celsius
Celsius (sometimes referred to as Centigrade) is the most commonly used unit of measurement for temperature in the world. The scientific community started using Celsius as its standard in the 19th century.

9. On the Celsius scale, 0 °C is the freezing point of water, while 100 °C is its boiling point, also at standard atmospheric pressure.

10. Kelvin
The Kelvin scale is named after the Belfast-born, Glasgow University physicist William Lord Kelvin (1824– 1907), who wrote of the need for an "absolute thermometric scale".

11. -Kelvin is a temperature scale designed so that zero degrees K is defined as absolute zero.
-Absolute zero is a hypothetical temperature. It does not exist in the universe as far as we know.

12. On the Kelvin scale, water boils at 373.16 K* and freezes at 273.16 K.
Absolute zero is at 0 K.
Kelvin is the standard unit of heat measurement for astronomy and physics.
*Kelvin does not use the degree symbol.

13. Temperature Conversion
Because we commonly use three different temperature units of measurements, it’s important to be able to convert one temperature unit to another.

14. Conversion Formulas Celsius to Kelvin: K = C° + 273.16°
Kelvin to Celsius: C° = K °
Celsius to Fahrenheit : F° = (9/5)C° + 32° - or - (1.8)C° + 32°
Fahrenheit to Celsius : C° = (F - 32°) x 5/9 - or - (F - 32°) X 0.56

15. Kelvin/Fahrenheit Conversion
Kelvin to Fahrenheit: F° = (K ) x °
Fahrenheit to Kelvin: K = (F - 32°) X