When you compare the density of water or air with another object how can you tell which has the lower or higher density?

-- If the object floats in water, then its density is less than the density of water.

-- If the object sinks in water, then its density is more than the density of water.

-- If the object floats in air, then its density is less than the density of air.

-- If the object sinks in air, then its density is less than the density of air.