Thermal expansion takes place in solids, liquids and gases. Explain above expansion with the help of two examples each from daily life activities. ( if possible a little detailed please )
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Thermal expansion can be defined as the change in the length, width, height, or volume of any material on changing the temperature. Thermal expansion is very evident in solids as atoms are densely packed. Thermal expansion of solids has loads of applications in day to day life.
Thermal Expansion in Metals
It is a well-known phenomenon now that substances expand on heating and contract on cooling. If you heat a body, it alters its dimensions. Depending on the shape of the body.
The expansion can occur in length in which case it is called Linear Expansion.
If we take a square tile and heat it, the expansion will be on two fronts, length and breadth, here it is called Area Expansion.
If we take a cube and heat it, all its sides expand and now the body experiences an increase in the overall volume due to this and it is called Volume Expansion.
Thermal Expansion Formula
Thermal expansion can result in linear expansion or area expansion or volumetric expansion. The corresponding formula is given below along with relevant terms. Thus, the formula used to represent the thermal expansion in a body is
Linear Expansion:
Δl/l=α.ΔT
where,
l is the initial length of the solid
Δl is the change in length.
αl length expansion coefficient
ΔT is the temperature difference
Area Expansion:
ΔA/A=αA.ΔT
where,
A is the initial area of the solid
ΔA is the change in the area.
αA Area expansion coefficient
ΔT is the temperature difference
Volumetric Expansion:
ΔV/V=αV.ΔT
where,
V is the initial volume of the solid
ΔV is the change in volume.
αV volume expansion coefficient
ΔT is the temperature difference
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