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Why is inver used in making a clock pend...

Why is inver used in making a clock pendulum?

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Invar is an alloy of nickel and steel. It has extremely small temperature coefficient of expansion. Due to it, the length of imvar pendulum does not change appreciably during summer and winter seasons. As a result of it, its time peirod of oscillations remains unchaged with change in season. Hence such clock gives correct time in all seasons.
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