Matter can exist as a solid, liquid, or gas.

The process by which substances are turned directly from a solid state into a gas is called sublimation.

Heat will break this chemical down into harmless gases.

When water is heated, it turns into gas.

Air is a mixture of gases that we cannot see.

Air is a mixture of several gases.

Air is a mixture of gases.

Air is a mixture of various gases.

Liquids are heavier than gases.

That would lead to the production of more carbon dioxide, the main gas responsible for global warming.

The gas gives off a strong, bad smell.

The gas was compressed into a gas cylinder.

This gas gives off a bad smell.

Ammonia is a colorless liquid or gas with a very strong smell.

Carbon dioxide is a gas that is produced every time a fuel such as coal, oil, or natural gas is burned.

Air is a mixture of several gases.