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Joseph Priestley
Joseph Priestly discovered 9 different gases. He discovered sparkling water. He and Antoine Lavoisier discovered oxygen -
Antoine Lavoisier
He gave oxygen his name. Disapproved phlogiston, proved air was made of multiple gases, -
Humphry Davy
Proved heat was not an element, discovered laughing gas, he also discovered that you could separate hydrogen and oxygen in water. from discovering that he found a way to separate solids with electricity.