Classify the following into solids, liquids and gases.

Oxygen, milk, common salt, wax, stone, L.P.G., carbon dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.

1. Solids — Common salt, wax, stone, sugar, coal, butter, copper
2. Liquids — Milk, mercury, blood, coconut oil, kerosene
3. Gases — Oxygen, L.P.G, carbon dioxide