what is meant by a substance ? give example
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a substance is a material
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1)physical material from which something is made or which has discrete existence the substance of nerve tissue.
2) matter of particular or definite chemical constitution.
for ex.
Iron is an element and hence is also a substance.
Methane is a compound and hence is also a substance.
Examples of non-substances:
Salt water is not a substance.
It is a mixture of two substances - sodium chloride and water.
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