Whether an object sinks or floats depends on its density. Everything is made of tiny microscopic particles known as molecules. Some objects have molecules that are packed tightly together. Some others have molecules that are loosely packed. This is called density. Objects with tightly packed molecules are more dense and sink.Eg. Rubber ball, Stone and Marbles. Objects with more loosely packed molecules are less dense and float.Eg. Cork, Plastic balls and Wood. Archimedes' principle: It states that, when a body is partially or completely immersed in a fluid, it experiences an apparent loss in weight that is equal to the weight of the fluid displaced by the immersed part of the body. Buoyant force: It is an upward force exerted by a fluid that opposes the weight of an immersed object. The three types of buoyancy are positive, negative and neutral. For more videos go to: www.youtube.com/user/learningjunction

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