State Archimedes' principle. Give two applications based on the principle.
Archimedes' principle: When an object is wholly (or partially) immersed in a liquid, it experiences a buoyant force (or upthrust) which is equal to the weight of liquid displaced by the object.
Buoyant force on an object = weight of liquid displaced by that object
Applications of Archimedes’ principle:
1. In determining the relative density of a substance
2. In determining the density of liquids by a hydrometer
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