Question

Why do we use invar material for the pendulum of good clocks ?

Answer 1

Invar is an alloy which has a small coefficient of linear expansion. The length of apendulum made of invar does not change with temperature and hence the time period of oscillation remains the same. Hence the time shown by the clock is accurate. That's why 'invar' is used for making the pendulumof a clock.......✌✌

Answer 2

We use "Invar" for the pendulum because of the following reasons:

• Invar is an alloy made from nickel and iron has a low coefficient of thermal expansion.

• Due to this reason, there will be no linear expansion of pendulum due to the rise in temperature.

• In other words, the length of the pendulum remains unaffected when there is rise in the temperature.

• Thus the time shown in the clock will be accurate.