Question

Expansion of matter on heating.
1)Electrical conductivity
2) Thermal conductivity
3) Thermal expansion​

Answer 1

Answer:

Most matter expands when heated and contracts when cooled, a principle called thermal expansion. The average kinetic energy of the particles increases when matter is heated and this increase in motion increases the average distance between its atoms.

so it a thermal expansion

hope it helps

Answer 2

Answer:

3) option is correct

i.e thermal expansion