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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.
Archimedes’ principle experiment using a hand balance: an iron piece weights less in water then in air
Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object (Archimedes’ principle).
Chemistry: transition from boiling water to vapor.
Illustration from an old chemistry book. Occasionally the same happens in the kitchen as well.
Heat of vaporization: transforming a substance from liquid into gas
Heating a glass tube with water, the water boils and transforms into gas by vaporization. In principle the glass tube can be replaced by a cooking pan.