Pendulum clocks generally run fast in winter and show in summer.Why?

1.	Pendulum clocks generally run fast in winter and show in summer.Why?
Answer» Solution :TIME period of a pendulum is given by In summer,I increases with the increases of temperature. So T increases and the clock RUNS slow.The reverse happens in winter.To MINIMISE this invar with very small coefficient of expansion is used to MAKE pendulum clocks.

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