jan 1, 1650 - Robert Boyle 1650 Boyle introduced a new definition of element as a substance that could not be broken down into simpler substances. He discovered that air is a mixture and not an element. Boyle tested his theory using experiments. He created an experiment to show that the pressure of a gas changed when its volume changed.

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Boyle introduced a new definition of element as a substance that could not be broken down into simpler substances. He discovered that air is a mixture and not an element. Boyle tested his theory using experiments. He created an experiment to show that the pressure of a gas changed when its volume changed.

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