Basic of Archimedes's principle of how fluid can make body to float and sink.

Archimedes principle states that the buoyant force is the weight of the fluid displaced ... When any boat displaces a weight of water equal to its own weight, it floats. This is often called the "principle of flotation" where a floating object displaces a weight of fluid equal to its own weight.

Explanation:

Density is the only thing affecting whethersomething floats or sinks. If an object has a higher density than the fluid it is in (fluid canmean liquid or gas), it will sink. If it has a lower density, it will float. Density isdetermined by an object's mass and volume.