Temperature Temperature ConversionsConversions

By By

Jenn FaustJenn Faust

Liz ClayLiz Clay

What is temperature?What is temperature?

Most people think of temperature as being Most people think of temperature as being hot or coldhot or cold

It is actually the average speed of air It is actually the average speed of air moleculesmolecules

Temperature is measured by a Temperature is measured by a thermometerthermometer

Types of Temperature ScalesTypes of Temperature Scales

Fahrenheit is the most common measure Fahrenheit is the most common measure we use in the U.S.we use in the U.S.

Celsius is the metric standardCelsius is the metric standardKelvin is used in the scientific worldKelvin is used in the scientific world

Fahrenheit to CelsiusFahrenheit to Celsius

To go from To go from degrees degrees Fahrenheit to degrees Fahrenheit to degrees

Celsius, use the formulaCelsius, use the formula

ººCelsius = Celsius = (º(ºFahrenheit - 32) x 5/9Fahrenheit - 32) x 5/9

Celsius toCelsius to FahrenheitFahrenheit

To convert degrees Celsius to degrees To convert degrees Celsius to degrees Fahrenheit, use this formula: Fahrenheit, use this formula:

ºFahrenheit = (ºCelsius x 9/5) + 32ºFahrenheit = (ºCelsius x 9/5) + 32

Celsius to KelvinCelsius to Kelvin In order to convert to Kelvin, the temperature In order to convert to Kelvin, the temperature

mustmust first be in degrees Celsius. first be in degrees Celsius. If the temperature is in degrees Fahrenheit, If the temperature is in degrees Fahrenheit,

convert it to degrees Celsius.convert it to degrees Celsius. Next use the formula:Next use the formula:

ºCelsius + 273 = KelvinºCelsius + 273 = Kelvin Kelvin does NOT use the degrees symbol, only

K units

Remember…Remember…

AlwaysAlways use use significant significant figuresfigures in temperature in temperature

conversions!!!conversions!!!

Example for Fahrenheit to CelsiusExample for Fahrenheit to CelsiusA pot of water is 92° Fahrenheit. What is the A pot of water is 92° Fahrenheit. What is the

temperature in Celsius?temperature in Celsius?

Use the formulaUse the formula (º(ºFahrenheit - 32) x 5/9 = Fahrenheit - 32) x 5/9 = ºCelsiusºCelsius

Substitute the 92°F in for Substitute the 92°F in for ººFahrenheitFahrenheit(92°F- 32) x 5/9 (92°F- 32) x 5/9 = = ººCelsiusCelsius

6060 x 5/9 = x 5/9 = ººCelsius)Celsius)33 = 33 = ººCelsiusCelsius

The pot of water is 33 The pot of water is 33 ºC.ºC.

Example for Celsius to KelvinExample for Celsius to Kelvin

It is 23It is 23°C in a room, what is the temperature in °C in a room, what is the temperature in Kelvin?Kelvin?

Use the formula Use the formula ºCelsius + 273 = KelvinºCelsius + 273 = Kelvin

Use Use 2323°C for °Celsius°C for °Celsius23ºC + 273 = Kelvin23ºC + 273 = Kelvin

300 = Kelvin300 = Kelvin

The temperature is 300 K.The temperature is 300 K.

Example for Fahrenheit to KelvinExample for Fahrenheit to Kelvin

If the temperature of a human body is 98.6If the temperature of a human body is 98.6º F, º F, what is the temperature in Kelvin?what is the temperature in Kelvin?

Since it is impossible to go directly from Since it is impossible to go directly from Fahrenheit to Kelvin, convert 98.6 ºF to ºCelsius Fahrenheit to Kelvin, convert 98.6 ºF to ºCelsius using the formula using the formula

ººCelsius = Celsius = (º(ºFahrenheit - 32) x 5/9Fahrenheit - 32) x 5/9ººCelsius = (98.6Celsius = (98.6ºFºF - 32) x 5/9 - 32) x 5/9

ººCelsius = 66.6 x 5/9Celsius = 66.6 x 5/937.0 = 37.0 = ººCelsius Celsius (continued)(continued)

ContinuedContinued

Next, convert Celsius to Kelvin, using the Next, convert Celsius to Kelvin, using the formula formula

ºCelsius + 273 = KelvinºCelsius + 273 = Kelvin37.0ºC + 273 = Kelvin37.0ºC + 273 = Kelvin

310 = Kelvin310 = Kelvin

The human body is 310 K. The human body is 310 K.

Quiz Time!Quiz Time!

It is 22It is 22ºC in a room. What is the temperature ºC in a room. What is the temperature in Fahrenheit?in Fahrenheit?

a. -5.55a. -5.55ºFºF

b. 71.6b. 71.6ºFºF

c. 295c. 295ºFºF

d. 65.9d. 65.9ºFºF

Oops… Try Again!Oops… Try Again!

RememberRememberºFahrenheit = (ºCelsius x 9/5) + 32ºFahrenheit = (ºCelsius x 9/5) + 32Use algebra correctlyUse algebra correctlyRemember significant figures!Remember significant figures!

Go BackGo Back

Good Job!Good Job!

You used the correct formulaYou used the correct formulaºFahrenheit = (ºCelsius x 9/5) + 32ºFahrenheit = (ºCelsius x 9/5) + 32

Now try another problem…Now try another problem…

Question 2Question 2

The temperature of a pot of water is 89The temperature of a pot of water is 89ºC. ºC. What is the temperature in Kelvin?What is the temperature in Kelvin?

a. 362 Ka. 362 K

b. -184 Kb. -184 K

c. 121 Kc. 121 K

d. 203 Kd. 203 K

Oops… Try Again!Oops… Try Again!

RememberRememberTo go from Celsius to Kelvin, add 273To go from Celsius to Kelvin, add 273Be careful with your algebra!Be careful with your algebra!

Go BackGo Back

Good Job!Good Job!You used the correct formulaYou used the correct formula

ºCelsius + 273 = KelvinºCelsius + 273 = Kelvin

Now try one more problem…Now try one more problem…

Question 3Question 3

A system has a temperature of 43A system has a temperature of 43ºF. What ºF. What is the temperature of the system in Kelvin?is the temperature of the system in Kelvin?

a. 316 Ka. 316 K

b. 210 Kb. 210 K

c. 92 Kc. 92 K

d. 280 Kd. 280 K

Oops… Try Again!Oops… Try Again!

Remember to first convert Fahrenheit Remember to first convert Fahrenheit temperatures to Celsiustemperatures to Celsius

ººCelsius = Celsius = (º(ºFahrenheit - 32) x 5/9Fahrenheit - 32) x 5/9Next, convert the Celsius temperature to Next, convert the Celsius temperature to

KelvinKelvin

ºCelsius + 273 = KelvinºCelsius + 273 = KelvinRemember significant figuresRemember significant figures!!

Go BackGo Back

Good Job!Good Job!

You’re finished!!!You’re finished!!!