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Ice vs. Dry Ice total BTU cooling to 25 degrees C

  1. Mar 26, 2009 #1
    I wanted to ask which would provide the largest total BTU cooling regular ice from water or dry ice to reach a temperature of 25 degrees C?

    1 lb of Ice would start at -3 degrees C to 25 degrees C at sea level = total BTU
    1 lb of Dry ice would start at -80 degrees C to 25 degrees C at sea level = total BTU
     
  2. jcsd
  3. Mar 26, 2009 #2

    mgb_phys

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    You need the heat of fusion = the energy released when a mass of a solid melts
    and the specific heat capacity = the energy released by deg rise in temperature once the substance has melted.

    Although the CO2 is at a lower temperature the heat capacity of a gas is much lower than water.
     
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