What is thermal expansion ? Write only its types.
It is our common experience that most substances expand on heating and contract on cooling. A change in the temperature of a body causes change in its dimensions. The increase in the dimensions of a body due to the increase in its temperature is called thermal expansion. There are three types of thermal expansion :
$(a)$ Linear expansion : The expansion in length is called Linear expansion.
$(b)$ Area expansion : The expansion in area is called Area expansion.
$(c)$ Volume expansion : The expansion in volume is called Volume expansion.
All are shown in the figure as below.
We would like to make a vessel whose volume does not change with temperature (take a hint from the problem above). We can use brass and iron $\left( {{\beta _{{\text{v brass }}}} = 6 \times {{10}^{ - 5}}/K} \right.$ and $\left. {{\beta _{{\text{viron }}}} = 3.55 \times {{10}^{ - 5}}/K} \right)$ to create a volume of $100\,cc$ . How do you think you can achieve this.
A gas in an airtight container is heated from $25°C$ to $90°C$. The density of the gas will
The weight of sphere in air is $50\ g$. Its weight $40\ g$ in a liquid, at temperature $20\,^o C$. When temperature increases to $70\,^o C$ , it weight becomes $45\ g$, then the ratio of densities of liquid at given two temperature is
It is known that wax contracts on solidification. If molten wax is taken in a large vessel and it is allowed to cool slowly, then
Ratio among linear expansion coefficient ($\alpha$), areal expansion coefficient ($\beta$) and volume expansion coefficient ($\gamma$) is