Joseph Priestley devised an experiment to find out that water alone was the cause of the increase in the weight of the plant.
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"Joseph Priestley (1733-1804) conducted an experiment showing that oxygen is produced by plants. He placed a mint with a burning candle in a closed container.
The flame of the candle used oxygen and went out. After 27 days, Priestley could light up the candle again.
This has shown that plants produce a gas that burns fuels. Oxygen is this gas.
But this process does not cause any changes in their weight.
"
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