The coffecients of thermal expansion in solids are mainly coffecient of volume expansion (gama) . Invar is used for making pendulum of clocks . Why ?

The coffecients of thermal expansion in solids are mainly coffecient o

1.	The coffecients of thermal expansion in solids are mainly coffecient of volume expansion (gama) . Invar is used for making pendulum of clocks . Why ?
Answer» SOLUTION :Due to its SMALL COFFECIENT of linear expansion.