Question #0bd50

2 Answers
Mar 29, 2017

Boyles law of gases would be obeyed by a fixed quantity of gas in the case of "#4)#at all temperatures and pressures" as long as the temperature remains constant over the observable time period.


Boyles law states that the volume of a gas is inversely proportional to the pressure applied to it when the amount of gas and the temperature stay the same throughout.

That means as more weight or force is applied to the gas, it will decrease in volume at the same rate.

Gasses such as air, oxygen, acetylene, carbon dioxide, natural gas, and many others are often compressed to be transported or for storage. By applying pressure to the gasses they will require greatly reduced container sizes.

You experiment with Boyles law every time you breathe. Watch your chest expand or contract in volume as the air goes in or out.
Your diaphragm provides the force behind the pressure changes.

Mar 29, 2017
  1. At high temperature and low pressures only


The gas laws only work perfectly for ideal gases, and gases at high temperatures and low pressures.

At low temperatures gases can start to turn into liquids and therefore would not obey the gas laws perfectly. Some gases like Helium, Neon and other noble gases only turn liquid at temperatures close to absolute zero. But other gases will start to become liquid at temperatures higher than absolute zero. Carbon Dioxide stops being a gas and becomes a solid, no longer obeying the ideal gas laws including Boyle's law.

At high pressure many gases also become liquid. Propane for example is pressurized and put into metal tanks. The metal tanks maintain the pressure that causes most of the gas to remain in the liquid state. Even gases like Oxygen and Nitrogen can be liquified at high pressure.

When a gas is a gas it obeys the gas laws like Boyle's Law. But at high pressure and extremely low temperatures gases no longer follow the ideal gas laws.