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The mass remain unchanged.
The water molecules remain unchanged.
The chemical composition remain unchanged.
The chemical formula remain unchanged.
The chemical composition of water remain unchanged.
The temperature remain unchanged.
The chemical composition remain unchanged.
The molecule of water remain unchanged.
The mass remain unchanged.
The mass remain unchanged.
The chemical structure of water remain unchanged.
The chemical nature of water remain unchanged.
The volume remain unchanged.
The water molecules remain unchanged.
The chemical formula of water (H2O) remain unchanged.
The temperature remain unchanged.
The structure of the molecule remain unchanged.