If there are more molecules in a given volume of air, the density is greater. If there are fewer molecule, the density decreases. Density=Mass/Volume
water density
mixing with sediment.
mixing with sediment
water density
deep
The movement of material due to differences in density caused by differences in temperature is called convection.
Buoyancy is primarily caused by density differences. When an object is immersed in a fluid, the upward force it experiences, known as buoyant force, is a result of the density difference between the object and the fluid. Objects with a lower density than the surrounding fluid will float, while those with a higher density will sink.
density currents and Earth's rotation.
Density Current
I sugest you look up "steam tables". Since convection currents are caused solely by diferences in density ... yes, it is assumed that tempreture diferences CAUSED the density gradiant - but that is not always true.
Motion of a fluid (liquid or gas) caused by density changes caused by temperature changes.
caused a rise in "housing prices" .