What Happens to Density As Temperature Increases?

What Happens to Density As Temperature Increases?

What Happens to Density As Temperature Increases?

In general, matter expands with rising temperature, which leads to a fall in density. However, there are important exceptions, such as the case with water when it transforms from the solid to the liquid state. Its molecules contract, leading to both a fall in density and a rise in density.

The ideal gas law, PV = nRT, shows that for gases, volume increases with an increase in temperature, which means that density falls. "P" is pressure, "V" is volume, "n" is number of moles and "R" is a constant. The equation shows that if number of moles and pressure are kept constant, an increase in temperature leads to an increase in volume. On the other hand, the equation "density = mass/volume" shows that for other matter, such as pure liquids and solids, density still tends to fall with increasing volume, as most matter expands with a rise in temperature anyway. This shows that, bar a few exceptional cases, density falls with an increase in temperature.