Question

Why is Boyle's law obeyed by N2,O2,and Co2 only at low pressure and high temperature

Answer 1

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.

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