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## Nootan Solutions Thermal Properties of Matter ISC Class-11 Physics Nageen Prakashan

 Class: 11 Subject: Physics Part-2 Chapter 17           Thermal Properties of Matter
 Board ISC Writer / Publications Nootan / Nageen Prakashan / Kumar and Mittal Topics Solved Numericals of page 689

## Nootan Solutions Thermal Properties of Matter ISC Class-11 Physics Nageen Prakashan

#### Thermal Expansion :

The increase of size of a body due to the increase in the temperature is called thermal expansion. Three types of expansions can take place in solids viz. linear, superficial and volume expansion,
(i) Superficial or Area Expansion : The increase in surface area of the solid on heating is called superficial expansion.
If A0 is the area of a solid at 0°C and A( its area at t°C then At = A0(l + βt)

(ii) Linear Expansion : The increase in the length of a solid on heating is called linear expansion.
If the temperature of a rod of original length l is raised by a small amount Δt, its length increases by Δl. Then the linear expansion is given by
Δl = l ∞ Δt
where a is the coefficient of linear expansion of the given solid. The unit of α is per degree Celsius (°C-1) in the CGS and per kelvin (K-1) in the SI system.
where β is known as the coefficient of superficial expansion. Unit of β is °C-1 or K-1.

(iii) Volume Expansion: The increase in volume of the solid on heating is called volume expansion.
The change in the volume of a solid with a change in temperature Δt is given by Δv = Vγ Δt
where y is the coefficient of volume expansion.

#### Thermal Capacity :

The thermal capacity of a body is the quantity of heat required to raise the temperature of the whole of the body through a unit degree. It is measured in calorie per °C or joule per K.

#### Specific Heat Capacity :

The specific heat capacity (also referred to as specific heat) of a substance is the amount of heat required to raise the temperature of a unit mass of substance through 1 °C. It is measured in cal g-1(°C)-1 or J kg-1 K-1.

### Chapter-17

Nootan Solutions Thermal Properties of Matter ISC Class-11 Physics Nageen Prakashan

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