Substance refers to what a mass exist to housing and touch. With both abiotic and such as people, plants, animals, cars, table, chair, air, etc. all kinds of substance contains a substance which substances, some of which may contain a substance only 1 type. But some species may contains more than 1 types, such as air contains nitrogen gas oxygen, argon gas, carbon dioxide. Gas and otherAround us there are a lot of things. There are both naturally occurring and human generated. Some substance treasure similar. And some of the treasure is different. That some substance similar to the treasure can be organized into categories of substance around us can be classified into categories based on the criteria. The use of particle size, electrical conductivity, state, etc.
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