Question 1

What is specific enthalpy?

Accepted Answer

Specific enthalpy is the total heat content per unit mass of a substance, measured in J/kg. It combines internal energy with the product of pressure and volume (h = u + Pv).

Question 2

Where is specific enthalpy used?

Accepted Answer

It is widely used in HVAC, steam tables, and phase-change calculations.

Question 3

What is the enthalpy of vaporization of water?

Accepted Answer

At 100 °C and 1 atm, the enthalpy of vaporization of water is approximately 2,257 kJ/kg (539.6 cal/g). This is the energy required to convert boiling water to steam without raising temperature.

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