Question

If in the following diagram the substance is in the solid state during stage 1, what is happening during stage 2?

Answer 1

Answer:

Here is the diagram.

Explanation:

Answer 2

If in the following diagram the substance is in the solid state during stage 1,  during stage 2 the substance is boiling or condensing .
Boiling is the term used to describe the rapid vaporization of a liquid. Boiling occurs when a liquid is heated to its boiling point. 
Condensation happens when the gas is changed into liquid.