Question

Define Latent Heat of vapourisation, $L_v$

• A. The specific latent heat of vaporisation of a substance is the quantity of heat required to convert a unit mass of the substance from liquid state to vapour state at its boiling point.
• B. The specific heat of vaporisation of a substance is the quantity of heat required to convert a unit mass of the substance from solid state to liquid state at its melting point.
• C. The specific latent heat of vaporisation of a substance is the quantity of heat required to raise the temperature of unit mass of the substance by $1^{o}C$.
• D. The specific latent heat of vaporisation of a substance is the quantity of heat required to lower the temperature of unit mass of the substance by $1^{o}C$.

Answer 1

The correct option is A The specific latent heat of vaporisation of a substance is the quantity of heat required to convert a unit mass of the substance from liquid state to vapour state at its boiling point.

The specific latent heat of vaporisation, $L_v$ of a substance is the quantity of heat required to convert a unit mass of the substance from liquid state to vapour state at its boiling point.