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e Fluids exert pressure in all directions, e Pressure exerted on fluids is transmitted equally in all directions., , 9. Buoyancy, , e When an object is immersed in a fluid it experiences an upward force called buoyant, , force. This property is called buoyancy or upthrust., , , , 10. Why objects float or sink when placed on the surface of water?, , e Take some water in a beaker. Take a piece of cork and an iron nail of the same mass., Place them on the water. The cork floats and the nail sinks., , e Ifthe density of an object is less than the density of a liquid, it will float on the liquid, and if the density of an object is more than the density of a liquid, it will sink in the, liquid., , 11. Archeimedes Principle, , e Archimedes’ principle states that, When a body is partially or fully immersed in a, fluid it experiences an upward force that is equal to the weight of the fluid displaced, by it’, , 12 .Relative density, , e The relative density of a substance is the ratio of the density of a substance to the, density of water. It is a ratio of similar quantities and has no unit.