Explain why mixing two, or more, substances is a physical change.

When two or more substances are mixed together but not chemically joined they are called as mixtures. Therefore, it is only a physical change taking place.

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A gaseous solute will  be able to be dissolve in a liter of liquid water by increasing the pressure of the gas. an example of this situation is the increase in solubility of carbon dioxide in sea water which turns it into an acidic environment for marines as pressure increases.