water on Mars!!!

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mad

mad

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Location
Milan, Italy
Dear Buddies!!
the last SECRET sensational NEWS form Mars is... we can dive there!!!!!!!!!!

I put my reversed striped red flag of Poverosub!

Mars.jpg


I hope you'll join my virtual no-profit diving on the red planet...

Ciaooooooooooo
 
Ok, now for the dive physics!

On mars, what does a one inch column of "atmospheric gasses" weigh?

Salt or fresh or "other"?

Depth to one atmosphere computation?

And oh so much more!

I'm such a party pooper, ain't I?
 
I'm not 100% sure but I think mars has half the gravity of earth or close to that, I assume water would have the same density? That would make for some super crapy NDL's would it not?
 
No, the gravity is not the real problem; it's the atmospheric pressure. I believe it's low enough that any water in liquid form would boil off into the atmosphere. Mind you the gravity also determines the atmospheric pressure, so I guess you are also correct that gravity would play a role in the NDL limits as well. If the water would just stay liquid long enough to dive in that is.

I’m up for a dive trip to Mars. Just think of all the people who would be jealous to see THAT log entry on your logbook.

And they said diving was not competitive!
 
Boys, you've got it all wrong - George Irvine III has beat ya to it.
He's been there, done it right enough and he's been off the planet for years! :)

(PS Dir folks reading - just having a bit of fun! Don't want the men in black turning up on my doorstep! )
 
YOU ASKED FOR IT! (Engineer Troll)

With a pressure of 7 millibars (Mars on a good day), water will boil at 35.49 degrees F. The average temperature on a hot day, I believe, is around 5 degrees F. Yes, it will be a huge block of ice, but it won't boil. (You will, but not ambient temperature water)

Given the normal Mars conditions, the ice will evaporate directly over time...but....

Lets assume for a second we had a magic little lake of liquid water we could dive in. Mars' gravity is 3.72 m/s^2 (0.3792 of Earth's). We can also assume zero absolute pressure on the surface for calculations (7 millibars is very small).

ATM (Earthly) Water Pressure at depth = 0.3792 X that of Earth at D depth. This means .38 atmospheres for every 32 feet, but without 1 ATM of added absolute pressure at the surface.

We could use the formula:

Mars rec Dive table Depth (MRDT)= [(depth from Terran rec table) + 32]/.3792

Replace the Earthly depth number with the MRDT. I would guess times are valid below a depth of 1 ATM Absolute Pressure. I don't think it is healthy to dive well below 1 ATM, do you?

Using regular air, you will be hypoxic until about a depth of 67.5 feet.

1 ATM of pressure is 84 feet. You can stay there indefinately - valid tables start here!

140 Earthly depth becomes 453 feet!

Offhand, I would think Bouyancy countrol would be different because of a smaller dP/dD value (pressure change per unit of depth) would affect BC air amounts.

Arthur C Clark wrote about what a low-gravity water world might be. it would be "low energy".

Come to think of it, this would be a nifty way to build an outpost. Assuming the water is kept from freezing, you could have a HUGE water storage tank with living quarters at below 84 feet depth! No need for pressurization systems beyond a maintainer - the water does it all. Maybe you could harvest fish at this depth for food. Kelp salad anyone?

Hmm.. You brought up some cool stuff here.

James




GQMedic:
Ok, now for the dive physics!

On mars, what does a one inch column of "atmospheric gasses" weigh?

Salt or fresh or "other"?

Depth to one atmosphere computation?

And oh so much more!

I'm such a party pooper, ain't I?
Click to expand...
 
At 7 Millibars (7/1000 of earth's) A 1" column of air would weigh 1.65 ounces.

It would probably be fresh water for our consumption. Salt probably doesn't exist easily on Mars, or at least we haven't found it yet.

Depth to 1 ATM = 84 feet (see above explanation)

Density of water would not change, assuming an incompressable liquid. Its volumetric weight WOULD be different, hence the different depth pressures.

Above 84 feet depth, regulator freezing will occur constantly (similar to icing at high altitudes).

Pressure is actually related directly to temperature, density, and a little for gravity (I think). The pressure on Venus is 80 bar at 900 degrees F. Titan, a moon of Saturn, has an atmosphere possibly as thick as Earth's and is about -300 degrees F (yes, minus). Lower gravity means lower required escape velocities. Molecular velocities are temperature and mass related. Helium's velocity curve exceeds that required to escape here, hence the small percentage on earth. Most existing Helium was probably created "recently" by radioactive decay. On Mars, Oxygen wouldn't last too long. What doesn't get eaten by the Iron would probably diffuse out. CO2 is probably heavy enough to stay, or at least take a very long time to escape.

OK, enough of my ranting - sorry :(



GQMedic:
Ok, now for the dive physics!

On mars, what does a one inch column of "atmospheric gasses" weigh?

Salt or fresh or "other"?

Depth to one atmosphere computation?

And oh so much more!

I'm such a party pooper, ain't I?
Click to expand...
 
so if the iron ate up all the o2, that means mars would be impossible to terraform?
 
So what?

Water is not peculiar to earth. Ice is water and ice abounds in space.
One of Jupiter's moons (Europa?) is quite nicely watered.
 
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