if a astronaut farts in zero g do they fly accost the room?

Answer 1

No they don't.

In actual fact, the abnormalities of flight do involve
quite a number of changes in air pressure as you
climb above the surface of the earth and fly through
various manuvers which exert "G" forces on your
body.

The human body has two ports for equalization of
internal pressures: the throat and the rear end. So
while this might sound a bit humorous, there is a
lot of burping and pharting involved in flight.

Since the internal atmospheric pressure within
most space ships and stations is just slightly
more than 1 atmosphere, the gas velocity exiting
the rear end during a space phart would be no
faster than that of a phart here on earth. Other
than a slight lift to release the gas, no actual motion
would be detected by an observer during the phart.

Other astronauts in the general vicinity would, however,
move away from the immediate area unless restrained
by the elaborate seat belt arrangements during docking
or manuvers.

The real problem which you failed to ask about is the
internal climate within a space suit. What happens
inside there during pharting? Well, I must admit that in
a confined space there is nothing so disturbing as a
string of continual pharts. Your helmet visor becomes
clouded and cleared again by the suit conditioning
system, or external support system equipment. Luckily
the pressurized suit support systems are designed to
handle these occasional bursts of methane gas.

Answer 2

In as much as a rocket is anything that flings hot matter in one direction to propel an object in the opposite direction, the astronaut does become a rocket in some tiny way. It would have to be a fart resulting from eating a double bean beef burrito washed down with Guinness Stout , to have any noticeable propulsion.

Answer 3

Flatulation in the enclosed environment of a space craft is both rude and hard on the air scrubbers, I must strongly advise against it when at all possible. Beans don't make for good Zero-G food in any case.

Answer 4

Technically yes, but the astronaut can just burp and go back in the other direction.

Answer 5

Yes, butte the speed they gain from the mass discharge is very small., so odds are they'd never acheive the escape velocity to avoid smelling it...