Heat Calculations

Question 1

State the meaning of Sensible Heat

Answer 1

It is the heat that causes a substance to change its temperature without undergoing a phase change (like melting or boiling)

Question 2

State the meaning of Enthalpy of evaporation/ fusion.

Answer 2

Evaporation - The amount of heat energy required to change a unit mass of a substance from a liquid to a gas phase at a constant temperature and pressure.

Fusion - The amount of heat energy required to change a unit mass of a substance from a solid to a liquid phase at its melting/freezing point while maintaining a constant temperature and pressure.

Question 3

State the difference between latent heat and sensible heat

Answer 3

The key difference is that sensible heat is associated with temperature changes, while latent heat is associated with phase changes at constant temperature.