Classify the following into solids, liquids and gases. Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
Solids : Common salt, Wax, Stone, Sugar, Coal, Butter, Copper.
Liquids : Milk, Mercury, Blood, Coconut, oil, Kerosene.
Gases : Oxygen, Water, vapour, Carbondioxide.