What is meant by a substance?

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Solution

Substance:
“A substance is a matter which has a specific composition and specific properties. ”
Every pure element or pure compound is a substance.
A substance can not be separated by any physical method.
The properties/composition of a pure substance is fixed.
Examples of substances are sugar as well as iron.
Properties of substance:
A pure substance is composed of only one state of matter.
It has a definite mass/weight/volume.
It is composed of atoms/molecules.