# 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.

Apr 20, 2004
15,815
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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.