On Mar 17, 10:19 am, Armin wrote:
Hi,
I was wondering if we can use plasma shields like "plasma window" or
force fields instead of airlocks to let the astronaut get through them
without letting air to go out.

Plasma is a hot, ionized gas. It is not an ideal pressure barrier, and
at about 1 atmosphere of pressure plasma would resemble a very high
temperature blow torch.

Although can we use magnetic fields to
draw back some of lost air?

Not really. Oxygen is paramagnetic, so it responds weakly to magnetic
fields, but it would require impractically high field strengths.
Nitrogen is diamagnetic, so it'd be weakly repelled by strong fields.

Mike Miller, Materials Engineer