Question

Give an example of how expansion and cooling of materials is used to our advantage?


please give me the answer please

Answer 1

One example is how thermometers are made or works. The amount of volume expansion of the liquid will help us to know the temperature of a body.

There’s another very important use of this thermal expansion. Consider a air tight piston cylinder arrangement. It’s been observed that if we heat the gas inside the cylinder, then it expands and the pressure inside the cylinder increases which pushes the piston outside the cylinder. This is the working principle of all the heat engines that are used in automobiles.

Using the same logic, jet engines, rocket engines are designed.

Answer 2

when a substance expand or contract ,the particles stay the same size
Only the spaces between the particles change
The particles in the solid vibrates more when it is heated thus take up more room -EXPANSION
Similar to the liquid and gases when heated