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Salt is a useful substance.

This substance will mix with water.

It's dangerous to mix these substances.

What does aspirin consist of?

The substance must be treated with acid.

The expedition's supplies soon gave out.

This substance is not poisonous in itself.

The substance is light enough to float on the water.

Water and ice are the same substance in different forms.

This substance is mostly composed of hydrogen and oxygen.

Physics can be defined as the science of matter, motion, and energy.

The chromosomes in our cells contain the whole of our genetic material.

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

Scientists deal mainly with physical matters.