Specific heat of water

Discussion in 'General Science' started by whale, Aug 22, 2009.

  1. whale

    Thread Starter Active Member

    Dec 21, 2008
    111
    0
    Hello there,
    please make me clear​
    my doubt is,
    to find the Calorific value of any kind of fuel, it is measured via heating water.
    the equation used is,
    Q = m x s x t

    m = mass of water in grams

    s = specific heat of water = 4.2.J/gm x °C

    t = rise in temperature of the water.

    i want to know , how the value of 4.2.J/gm x °C is obtained for water.
    please ,let me know the exact derivation behind it.
    or give me link,from where i can get the information.
    --------- advance thanks.------------
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    It isn't "derived", it's found by making an experimental measurement. A known mass of water has a known amount of energy dumped into it and the temperature rise of the water is measured.

    You could make the measurement yourself if you're so inclined -- here's a site that gives a method.
     
  4. whale

    Thread Starter Active Member

    Dec 21, 2008
    111
    0
    thank you , i found it.
     
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