## 1) Entropy:

Entropy is
defined as the quantitative measure of disorder or randomness in a system.

*Example*:

## 2) Enthalpy:

It is the sum of
the internal energy added to the product of the pressure and volume of the
system.

It is denoted as
H.

## 3) Sensible heat:

Change in
temperature without phase transformation.

## 4) Latent heat:

Change of phase of a substance at a constant temperature.

Latent heat for
Ice to Water = 80 kCal/kg.

Latent heat for
Vapour to Water = 560 kCal/kg.

## 5) Thermal Conductivity:

It is the amount
of heat conducted by a substance per unit time, per unit kg, per unit the temperature difference of material.

K = BTU/hr

Q = UA** Î”**
T, Q = Cp** Î”**T

_{f}_{i
}= thermal conductance of inside of the wall._{}

f_{0 }= thermal conductance of outside
of the wall.

A = thermal conductance of air inside the
material.

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