Gases are very different from solids and liquids in a few important ways:

1. Shape and Volume:

   • Gases: They don’t have a set shape or size. They spread out to fill any space they are in.
   • Solids: They keep their shape and size no matter what.
   • Liquids: They have a certain volume, but they change their shape to match the container they are in.

2. Density:

   • Gases: They are usually lighter than solids and liquids. For example, helium is lighter than air.
   • Solids and Liquids: These are heavier because their particles are packed very closely together.

3. Compressibility:

   • Gases: They can be easily squeezed into a smaller space.
   • Solids and Liquids: They don’t change size or shape easily when you try to compress them.

These differences are why gases, solids, and liquids act in their own special ways!