The metric system uses units such as meter, liter, and gram to measure length, liquid volume, and mass, just as the U.S. customary system uses feet, quarts, and ounces to measure these.

Density equals the mass of the substance divided by its volume; D = m/v. Objects with the same volume but different mass have different densities.

If the temperature of the gas is doubled and the volume is quadrupled, the pressure becomes half the initial pressure.

Doubling the absolute temperature of a gas also doubles its volume, if the pressure is constant, and vice versa. A constant pressure can only be maintained if there is some force (usually external to the body of gas in question) maintaining a constant force on the gas.

For example, if you decrease the temperature of the gas by a greater degree than the decrease in pressure, the volume will decrease. However, if you decrease the pressure by a greater degree than the decrease in temperature, the volume will increase.

When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. This is shown by the following equation – which is often called Boyle’s law. It is named after 17th century scientist Robert Boyle.

Volume and Pressure: Boyle’s Law. Decreasing the volume of a contained gas will increase its pressure, and increasing its volume will decrease its pressure. In fact, if the volume increases by a certain factor, the pressure decreases by the same factor, and vice versa.

Calculate the pressure when the volume increases to 8.00 × 10 -6 m 3 at a constant temperature. Pressure and volume of a given mass of gas at a constant temperature can be given by: P 1 × V 1 = P 2 × V 2 (where P 1 and V 1 are the pressure and temperature at the start, and P 2 and V 2 are at the end).

Pressure vs volume Water pressure is the amount of force that pushes water through the pipes and it’s normally determined by the water company. Water volume is the actual amount of water that flows through the faucets and taps.