magnetic field

"how magnetic field affect the flow of gases?..."

Magnetic fields do NOT affect the flow of gases except perhaps in some unusual circumstances or conditions of the gas.

You have not defined what you mean by "the flow of gases"

This definition covers a lot of territory:

"Gas is a phase of matter in which the molecules and/or atoms are widely separated, move around freely, and move at high speeds."

In "normal" magnetic fields, a flow of "normal" (ex: N₂, O₂, He, Ar, etc) gases at STP (standard pressure and temperature) will not be affected.

However, in the case of extremely high magnetic flux, or high temperatures, metallic vapors, electric fields, radiation etc, that can produce ionization, the answer can be very different.

For some insight you would explore the terms "magnetohydrodynamics", part of which involves gases, and "plasma physics" (plasma being an ionized gas).

Some helpful links:

http://en.wikipedia.org/wiki/Magnetohydrodynamics

http://www.du.edu/~jcalvert/phys/mhd.htm

http://www.answers.com/topic/magnetohydrodynamics

http://en.wikipedia.org/wiki/Plasma_(physics)

Greg

"You have not defined what you mean by "the flow of gases."

I took it to be a simple question and provided the simple answer.

You have covered the bases of any further expansion of the original inquiry in good detail for further consideration and/or study.

Hi Stan,

My answer was in no way meant as a contradiction to yours, rather it was an elaboration based on my sometimes misguided tendency to take a step back when considering questions to try and judge context and underlying intent.

As a matter of fact, my first answer began even closer to yours, but as I was previewing it, I lost my connection, and with it, my comment. When I re-wrote it, I started off more focused on what had been the latter part of my comment, having to do with the definition of "gas", matter behaving as a gas in certain respects, extremely high magnetic flux, and plasmas.

Trying to discern what the questioner means here is oftentimes a "roll of the dice".

Greg