Question

use particle theory to explain why solids and liquids can not be compressed.

Answer 1

solid, liquid, gas, and plasma. These are the four states of matter. You can recognize each state because they have different properties. A property of a material describes how it behaves. This behavior is not observable at the chemical level due to microscopic sized particles. We can observe how many H2O particles behave when we open a faucet, releasing water, which is a lot of H2O particles in their liquid state. Of course we can observe other states of H2O particle groupings, at low temperatures they freeze, demonstrating a solid property. At high temperatures they form a gas called steam. Behavior is how something responds when placed in a container, when it is squeezed, or released.

Answer 2

solid
=> solid cannot be compressed due to high intermolecular force of attraction between their particles.
liquid
=>liquid also cannot be compressed due to intermolecular force of attraction btw their particles but their force of attraction is low in comparison to solid thus liquid can be compressed for sometime.