Question

A circular metal disc is heated.
Which quantity decreases?

Answer 1

Answer:

when a metal is heated its density decreases there are two sources that give rise to decrease of P (1 )the thermal expansion of the solid and (2 )the formation of vacancies ( section 4 . 2 ) ....

hope this helps you..

Answer 2

Answer:

The density

Explanation:

This is because as you heat something up, the volume normally increases because the faster moving molecules are further apart.

The equation density= mass/volume  

So increasing the volume decreases the density.