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VIDEO

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Due to ability of invar (An alloy of steel and nickel)to show exceptionally small expansion even when heated to high temperature it has many practical applications .For example, Invar is used in used in watches and thermostats.

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We often use to keep the metal lid of glass container . The reason behind it is that the high-temperature water causes the expansion of metal lid whereas Glass being a bad conductor of heated and also having a low coefficient of expansion remain unaffected .

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Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature, through heat transfer.

The coefficient of thermal expansion is used:

in linear thermal expansion

in area thermal expansion

in volumetric thermal expansion

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A bushing can be fitted over a shaft by making its inner diameter slightly smaller than shaft’s  diameter .After then it is heated until it fits over the shaft and on cooling it makes a tight fit

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Most of the thermometers contain a liquid (usually alcohol or mercury) .This liquid is constrained to flow in  one direction only  (along the tube) due to changes in volume that are caused because of temperature change .

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The hot air inside the balloon bag expands more quickly than the outside container therefore  it stretches the bag so that it expands and displaces the colder (heavier) air outside the bag.