 # 10th Class Chapter No 11 - Calorimetry in science for ICSE

Heat – The kinetic energy due to random motion of the molecules of a substance is known as its heat energyEach body possesses heat energy in form of its internal kinetic energy.

Calorimetry – The measurement of the quantity of heat is called calorimetry.

Temperature – The average internal kinetic energy of molecules of a substance is a measure of the temperature of that substance.

• For two bodies in contact, heat flows from a body at a higher temperature to a body at a lower temperature.
• It is the temperature which determines the direction of flow of heat.

Principle of calorimetry

• When a hot body is mixed or is kept in contact with a cold body, heat energy passes from the hot body to the cold body, till both the bodies attain the same temperature.
• If no heat energy is exchanged with the surroundings, i.e., if the system is fully insulated, then
• Heat energy lost by the hot body= Heat energy gained by the cold body.
• For two bodies A and B in contact and at temperatures TAand TB respectively, such that TA> TB, we have from the principle of calorimetry the equation:
• mAcA(TA – T) = mBcB (T – TB).
Posted in 10th on July 15 2020 at 04:03 PM

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