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Amout of energy needed to warm air

  1. Jun 26, 2012 #1
    Hi,

    How do I calculate the amount of energy needed to warm air from 20 °C to 100 °C in a constant volume (1680 cm3)?

    Thank you.
     
  2. jcsd
  3. Jun 26, 2012 #2

    phyzguy

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    Science Advisor

    The specific heat of dry air is about 1.0 kJ/kg-K, and the density of dry air is .0013 g/cm^3, so the air in 1680 cm^3 will weigh 2.2 g or 2.2E-3 kg. So to heat it up 80 C will take:

    E = 1.0 kJ/kg-K * 2.2E-3 kg * 80 K = 0.18 kJ = 180J.

    Here's a good source for some of these constants.
     
  4. Jun 26, 2012 #3
    Thank you!
     
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