Describe one example each of expansion in solids, liquids and gases.
Expansion of solid: Solids also undergo thermal expansion. Railroad tracks and bridges, for example, have expansion joints to allow them to freely expand and contract with temperature changes.
Expansion of liquid: Heating of water expands it and converts it to gas
Expansion of gas: When a balloon is partially inflated in a cool room it expands to full size when put in warm water. This all is due to thermal expansion. So, an increase in the dimension of a body due to an increase in temperature is thermal expansion
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