Question

which of the following can be highly compressed?
a nitrogen gas
b liquid water
c an iron bar
d milk

Explanation:

Gases have large inter - molecular spaces, allowing for high compressibility. Liquids like water and milk have relatively small inter - molecular spaces and are less compressible. Solids like an iron bar have very small inter - molecular spaces and are almost incompressible. Nitrogen is a gas.

Answer:

A. nitrogen gas