Canyons on Mars habitable?

Question

What id like to know is If you took a small Canyon say about 300 meters deep & you had a heavy power supply & a "magic" Air generator (oxy/nitro mixutre), & dammed it at etehr end,

Would that canyon fill properly?
what i mean is if you pumped continuly (air, no dodgy remarks)
into the canyon would it be habbitable, i mean could you breath it? would there be enough pressure? (dont even go down the Radiation path)

And if it did work, & it leaked how fast Verry roughly would it leak?
would it be slow enough for plants to take over?

Answer 1

I think you'd need a roof over it. It's gonna want to diffuse.
Just something to slow down the loss; wouldn't have to be leak tight.

Plus heat it up!

Answer 2

Well... Now there is a long and deep question.

First we need to contend with the temperature on Mars.
The temperature on the surface of Mars ranges from
minus 195 Degrees F up to 77 Degrees F. So, it gets
way, way below freezing and then comes up to a nice
77 degrees in the bright sunlight during the summer.
A day on Mars is about like a day on Earth, but the years are twice as long as on Earth (687 Days). That means that the winters (remember that minus 195 Degrees F)
last about 343 Days.

The atmosphere on Mars is a thin one comprised mostly of carbon dioxide and iron oxide dust. I do not have a
figure at hand for the atmospheric pressure on Mars. Every reference I picked up said "thin" atmosphere. So
my guess is that if you started pumping out oxygen and nitrogen from some kind of machine those gases might stay in the general area given zero wind conditions.

I feel that the challenge of creating an atmosphere on Mars is far, far beyond the capabilities of a single man made machine (or even multiple machines)however "magic" it (or they) might be. Some kind of a closed dome might work much better.

Answer 3

how big the leak was would determine how fast the air would seep out; how much air you pumped in would determine the pressure.
Unless there were the proper nutrients in the martian soil plants would not grow.