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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).