The density of heated air is less than the density of cooler air.

subtract 0.0011 from the density in vac to get density in air.

subtract 0.0011 from the density in vac to get density in air.

-- 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.

Air has both density and pressure.