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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

substance go
a particular kind or species of matter with uniform properties

refrigerant go
any substance used to provide cooling (as in a refrigerator)

cryogen go
a liquid that boils at below -160 C and is used as a refrigerant

liquid air
air in a liquid state

noun.substance

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