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Fluids thermal expansion: the volume of a fluid increases when temperature rises
By heating a flask full of water it may be observed that as the temperature raises the water expands and its density decreases.
Physics: heat dilates air. Heating a glassball tube, air expands out of it as bubbles through water
Heating a glassball tube, the air contained in it expands out of it and forms bubbles through water.
Lavoisier experiment: discovery water composition by decomposing water vapour over hot iron.
The discovery that water is a compound of hydrogen and oxygen was made in the early 1780s. Lavoisier demonstrated that iron reacts with water releasing hydrogen.