Question

2. Explain the expansion of solid.​

Answer 1

Explanation:

In physics, 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.

1. The expansion can occur in length in which case it is called Linear Expansion.
2. 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.
3. 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.
4. Thermal Expansion Formula
5. 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:

Δll=αl.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:

ΔAA=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:

ΔVV=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

Here, the alpha represents the coefficient of linear expansion and it is a characteristic of the substance the body is made of. For example, for the same temperature rise, copper expands almost five times more than glass. Generally, metals expand more and have higher values of alpha compared to gases and liquids.

Answer 2

Answer:

All the three state of matter.

( solid,liquid, gas) expand when heated.

The atom themselves do not expand, but the volume they take up does when a solid is heated its atom vibrate faster about their fixed point.