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State any two daily life phenomenon which are based on Archimedes’ principle. Discuss therole of Archimedes’ principle in industry and defence.



"When an object is partially or completely immersed in fluid it experiences an upward force that is equal to the weight of fluid displaced "


It is used in hydrometers and lactometers
It is also used in designing ships and submarines 

A hot air balloon rises and floats due to the buoyant force (when the surrounding air is greater than its weight)
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