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Temperature Conversions

Temperature Conversions. By Jenn Faust Liz Clay. 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. Types of Temperature Scales.

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Temperature Conversions

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  1. Temperature Conversions By 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. Fahrenheit to Celsius • To go from degrees Fahrenheit to degrees Celsius, use the formula ºCelsius = (ºFahrenheit - 32) x 5/9

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

  6. Celsius to 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 + 273 = Kelvin • Kelvin does NOT use the degrees symbol, only K units

  7. 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 + 273 = Kelvin Use 23°C for °Celsius 23ºC + 273 = 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 • Next, convert Celsius to Kelvin, using the formula ºCelsius + 273 = Kelvin 37.0ºC + 273 = 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. -5.55ºF b. 71.6ºF c. 295ºF d. 65.9ºF

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

  14. 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. -184 K c. 121 K d. 203 K

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

  17. Good Job! • You used the correct formula ºCelsius + 273 = 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. 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 + 273 = Kelvin • Remember significant figures! Go Back

  20. Good Job! You’re finished!!!

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