Write a note on latent heat of substance.

1.	Write a note on latent heat of substance.
Answer» 1. Latent heat of a substance is the quantity of heat required to change the state of unit mass of the substance without changing its temperature. 2. Mathematically, if mass m of a substance undergoes a change from one state to the other then the quantity of heat absorbed or released is given by, Q = mL where. L is known as latent heat. 3. It is characteristic of the substance. 4. Its SI unit is J/kg. 5. The value of L depends on the pressure and is usually quoted at one standard atmospheric pressure.

Answer»

1. Latent heat of a substance is the quantity of heat required to change the state of unit mass of the substance without changing its temperature.

2. Mathematically, if mass m of a substance undergoes a change from one state to the other then the quantity of heat absorbed or released is given by, Q = mL

where. L is known as latent heat.

3. It is characteristic of the substance.

4. Its SI unit is J/kg.

5. The value of L depends on the pressure and is usually quoted at one standard atmospheric pressure.

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