SSC MTS EXAM

Detailed explanation-1: -Q = m L v Q = m L v (for vaporization/condensation), where L f L f is the latent heat of fusion, and L v L v is the latent heat of vaporization. The latent heat of fusion is the amount of heat needed to cause a phase change between solid and liquid.

Detailed explanation-2: -The specific latent heat of a substance is the amount of energy needed to change the state of 1 kg of the substance without changing its temperature. The distinction from latent heat is due to the term “specific, ‘’ which tells us that the substance is being measured per unit mass.

Detailed explanation-3: -latent heat, energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature.

Detailed explanation-4: -A phase change is when matter changes to from one state (solid, liquid, gas, plasma) to another. (see figure 1). These changes occur when sufficient energy is supplied to the system (or a sufficient amount is lost), and also occur when the pressure on the system is changed.