ICSE - IX

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Thermal Expansion in Daily Life

Thermal Expansion in Daily Life

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Matter expands on heating and contracts on cooling. The expansion of matter on heating is called thermal expansion. It has several applications in everyday life. Thermal expansion and contraction is used to join steel plates in ships and boilers firmly together. The bimetallic strip used in a thermostat works on the principle of thermal expansion. A thermometer also works on the principle of expansion and contraction of matter. The pendulum in a pendulum clock is made of invar-steel that has negligible expansion and contraction. Blacksmiths use the principle of expansion on heating and contraction on cooling, to fix the iron rim onto the wooden wheel of a bullock cart. When boiling water is poured into a thick glass, it cracks. This is also because of thermal expansion. A small gap is left between two concrete slabs in a cement road to allow for thermal expansion during summer, else they would crack.

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