March 2, 2015

What is latent heat?

Heat may be stored in a substance in two forms: sensible heat and latent heat. Sensible heat is readily perceived by the sense of touch and produces a temperature rise or fall as heat is added or removed from a substance. Sensible heat is the heat that changes the temperature of a substance without any phase change.

The heat required to bring about a change of state at constant pressure with no change in temperature is called the latent heat.

It is the heat that necessary to change the physical state of 1 kg of any substance, i.e. from solid to liquid or liquid to vapor or vice versa.

In the case of food materials, latent heat refers to latent heat of fusion during freezing of products and the latent heat of melting during heating and thawing operation.

In foods of high fat content and in the temperature range, where phase transitions in fats occur, it is necessary to take into account the latent heat of crystallization of fats.

The latent heat of fusion of fats is in the range from 80 to 200 J/g. It increases with increasing length of the fatty acid chain and the degree of saturation.
What is latent heat?


at 11:25 PM
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