mention one application of expansion on heating and contraction on cooling
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The applications of contraction and expansion are as follows.
1.) Used in thermometers.
The mercury in thermometers expands when the thermometer comes into contact with heat and contracts when subjected to low temperatures thus making it possible to measure temperature changes.
2.) Expansion is also used in hot weather balloons.
The expansion of air in the balloons causes them to rise and if the temperature falls the air inside contracts and the balloon falls.
3.) Metal riveting
Expansion is used in joining of two metal sheets.
4.) Opening a tin of jam
If heat is applied to the lid the lid expands and thus we are able to open the jam.
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