Question

-------- do not have fixed melting or boiling point

Answer 1

Answer:

Explanation:

The melting point of a substance is where the solid phase changes into the liquid phase. Since air is a mixture of gases, so, all the different gases have different melting and boiling points. So, air has no boiling point and it also has no melting point.

Answer 2

Air do not have fixed melting or boiling point.