Question

why is invar used to manfacture pendulum?​

Answer 1

Hey friend,

Invar is an alloy which has a small coefficient of linear expansion. The length of a pendulum 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.  

Hope it helps...

Answer 2

Answer:

Invar is an alloy which has a small coefficient of linear expansion. The length of a pendulum 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 pendulum of a clock.