Match the three phases of matter.
1. fixed volume; variable shape gas
2. fixed volume; fixed shape liquid
3. variable volume; variable shape solid

Matter is defined as anything which has volume and mass. Three phases of matter: Solid, liquid and gas.

Solid: The substances in which particles are closely packed, has definite volume and definite shape.

Liquid: Particles are loosely packed as comparison to solid, has definite volume and take the shape of container i.e. indefinite shape.

Gas: Particles are loosely packed, has indefinite volume and indefinite shape.

Thus,  gas: variable volume; variable shape

liquid: fixed volume; variable shape    

solid: fixed volume; fixed shape