Float - stay above the surface of the water , Density - is the degree of the compactness of an object , Upthrust - is the force that pushes an object  up in a liquid , Sink  - to go below the surface of the water, Displacement - is the removal of something from its usual place or position by something which then occupies that place or position., Empty bottle,balls and balloons - are hollow objects, Wood, apples and sponges - are less dense than water so they will float , Coins, rocks, and marbles - are more dense than water. They will sink, The larger surface area of an objects - stronger upthrust , Objects with tightly packed molecules  - will sink, Objects with loosely packed molecules - will float , Every things are made - by molecules , Factors affecting on float or sink - objects shape ,objects material and object density,

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