In an average room what is the average verlocity of the air particles?
Answers:
The average velocity of air particles is ZERO. They maybe moving around alot, but the movements are random, so the net velocity adds up to zero. Also, this average velocity does NOT depend on temperature, because there has to be a temperature gradient, meaning some parts of the room hotter or colder than the rest to create a net air flow. If the entire room is at a certain temperature but is in equilibrium, then the average velocity is still zero.
who cares
i think it is the same as the movement of air in the room
It depends on the average temperature.
Zero.
very slow, with top verlocity due to closing doors, coughing so one can asume it is ext. 1metre/sec, even slower. in a room, if you shine a light, you look into the light- you can see dust particles in the room where the light reflects it.
It does depend on the temperature and pressure of the air.
It is close to the speed of sound in air (about 330 m/s) since sound is transmitted in air by colliding gas molecules.
The exact (average) velocities can be calculated from a formula you'd find in an advanced Physics text book.
Most of the air is nitrogen. Smaller, lighter molecules (e.g. argon) move faster. Larger, heavier ones (e.g. carbon dioxide or ozone) move more slowly.
depends with the average temperature
As stated previously depends on the molecules and the air temperature and also its pressure. These will depend on climate, altitude, central heating/air conditioning and so on.
Assuming no draughts or air movement, the person who said 'Zero' is correct, in the sense that averaging the velocity (which is speed and direction) must come to zero. However I guess you are really more interested in the average speed regardless of direction.
There is also a distinction between what is called 'an ideal gas' and a 'non-ideal gas'. A lot of gases are close enough to ideal to use the ideal gas theory. In which case what you are looking for is a thing called the 'root mean square velocity'.
If you work this out for Oxygen at 25C you get a value of about 480 m/s - faster than most rifle bullets. Nitrogen travels faster, and if there were any Hydrogen in the room it would be hurtling about much, much faster.
However the molecules only travel a short distance before hitting other molecules and being deflected. So the other important factor is 'mean free path'.
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