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What? They are definitely not behaving according to the ideal gas law: PV = nRT, that law only work for low pressures and totally inert gasses like helium, argon and so on, and then not even that accurate.

The ideal gas law makes several assumptions.

The particles collide completely elastically (no energy is transfered at collision)

The particles does not in anyway react with one or other

The particles don't affect each other besides from "ideal collisions" (=no attraction/repulsion because of charge and so on)

And in fact ALL those assumptions are false for normal air at 1 atm.

The equation that accurately describes real gasses and mixtures of different real gasses is extremely complicated and not completely accurate either and it uses a lot of gas-specific constant and is very unwieldy. Which is why the ideal gas equation of state is so often used at lower level courses..

Another way of modelling real gasses iw to run a simulation; simply have the gas molecules bounce around in a computer model with all their properties built into the model as accurately as possible. A simple problem could probably be run fairly quickly by a normal desktop PC, but more complex scenarios would need a supercomputer/cluster to come up with a quick answer. The supercomputer doing weather forecasting (can't remembers its name, Earth Simulator) has such a gas model built into its larger climate model.

So that is what I got from your question.

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How does the number of particles affect the pressure of a gas?

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Comparison between normal temperature pressure and standard temperature pressure?

Normal temperature pressure refers to conditions at 0°C (273K) and 1 atm pressure, while standard temperature pressure refers to conditions at 25°C (298K) and 1 atm pressure. These conditions are used as reference points for certain calculations and measurements in chemistry and physics. The main difference is the temperature at which they are defined, with standard temperature pressure being at a slightly higher temperature than normal temperature pressure.


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