1. Temperature ConversionsBy
Jenn Faust
Liz Clay

2. What is temperature?
Most people think of temperature as being hot or cold
It is actually the average speed of air molecules
Temperature is measured by a thermometer

3. Types of Temperature Scales
Fahrenheit is the most common measure we use in the U.S.
Celsius is the metric standard
Kelvin is used in the scientific world

4. ºCelsius = (ºFahrenheit - 32) x 5/9
Fahrenheit to Celsius
To go from degrees Fahrenheit to degrees
Celsius, use the formula
ºCelsius = (ºFahrenheit - 32) x 5/9

5. ºFahrenheit = (ºCelsius x 9/5) + 32
Celsius to Fahrenheit
To convert degrees Celsius to degrees Fahrenheit, use this formula:
ºFahrenheit = (ºCelsius x 9/5) + 32

6. Celsius to Kelvin ºCelsius + 273 = Kelvin
In order to convert to Kelvin, the temperature must first be in degrees Celsius.
If the temperature is in degrees Fahrenheit, convert it to degrees Celsius.
Next use the formula:
ºCelsius = Kelvin
Kelvin does NOT use the degrees symbol, only K units

7. Always use significant figures in temperature conversions!!!
Remember…
Always use significant figures in temperature conversions!!!

8. Example for Fahrenheit to Celsius
A pot of water is 92° Fahrenheit. What is the temperature in Celsius?
Use the formula
(ºFahrenheit - 32) x 5/9 = ºCelsius
Substitute the 92°F in for ºFahrenheit
(92°F- 32) x 5/9 = ºCelsius
60 x 5/9 = ºCelsius)
33 = ºCelsius
The pot of water is 33 ºC.

9. Example for Celsius to Kelvin
It is 23°C in a room, what is the temperature in Kelvin?
Use the formula
ºCelsius = Kelvin
Use 23°C for °Celsius
23ºC = Kelvin
300 = Kelvin
The temperature is 300 K.

10. Example for Fahrenheit to Kelvin
If the temperature of a human body is 98.6º F, what is the temperature in Kelvin?
Since it is impossible to go directly from Fahrenheit to Kelvin, convert 98.6 ºF to ºCelsius using the formula
ºCelsius = (ºFahrenheit - 32) x 5/9
ºCelsius = (98.6ºF - 32) x 5/9
ºCelsius = 66.6 x 5/9
37.0 = ºCelsius (continued)

11. Continued ºCelsius + 273 = Kelvin The human body is 310 K.
Next, convert Celsius to Kelvin, using the formula
ºCelsius = Kelvin
37.0ºC = Kelvin
310 = Kelvin
The human body is 310 K.

12. Quiz Time!
It is 22ºC in a room. What is the temperature in Fahrenheit?
a ºF
b. 71.6ºF
c. 295ºF
d. 65.9ºF

13. Remember Go Back Oops… Try Again! ºFahrenheit = (ºCelsius x 9/5) + 32
Use algebra correctly
Remember significant figures!
Go Back

14. ºFahrenheit = (ºCelsius x 9/5) + 32
Good Job!
You used the correct formula
ºFahrenheit = (ºCelsius x 9/5) + 32
Now try another problem…

15. Question 2
The temperature of a pot of water is 89ºC. What is the temperature in Kelvin?
a. 362 K
b K
c. 121 K
d. 203 K

16. Oops… Try Again! Go Back Remember
To go from Celsius to Kelvin, add 273
Be careful with your algebra!
Go Back

17. Good Job! Now try one more problem… You used the correct formula
ºCelsius = Kelvin
Now try one more problem…

18. Question 3
A system has a temperature of 43ºF. What is the temperature of the system in Kelvin?
a. 316 K
b. 210 K
c. 92 K
d. 280 K

19. ºCelsius = (ºFahrenheit - 32) x 5/9
Oops… Try Again!
Remember to first convert Fahrenheit temperatures to Celsius
ºCelsius = (ºFahrenheit - 32) x 5/9
Next, convert the Celsius temperature to Kelvin
ºCelsius = Kelvin
Remember significant figures!
Go Back

20. Good Job!
You’re finished!!!