Water

Exercises
Water can absorb more heat than most other liquids before its temperature increases.
One gram of water absorbs 4.2 Joules of energy before it increases in temperature by 1C. The amount of energy required to raise one grams of water by 1C is known as the specific heat capacity. This is why water makes a good coolant in cars. It can absorb a great deal of heat energy before its temperature increases.
Calculations
Heat (J) =mass(g) X specific heat X change in temperature.

How much heat is needed to raise 10 grams of water by 2oC.
Heat = 10 X 4.2 X 2
Heat = 84Joules.

1) How much heat energy is required to change 10 grams of water from 16C to 20C ?
2) How much heat is given out when 20 grams of water cools from 20C to 12C?
3) If you supply 500Joules of energy to 50grams of water at 22C what will the temperature increase to?

4) Why is water rather than oil used in vehicles as the coolant?

5) Why is this boy blowing air onto his hot food?
We often cool our food by blowing air onto its surface
Our vehicles use water as the coolant.