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acutely humans would have no problem living on planets with million of pounds of pressure .
Its the mix of the atmosphere that matters more then the pressure .
earth 14.50 per inch now make it 14 million per inch then reduce O2 to around 1 % incress nitrogen to 50 - 70 % keep co 2 were it is at more or less and you would be just fine .
This is why people can deep dive . Its changing back to normal that can be a problem as it can take hours or even days .

Ah, but try living on venus. Every probe that they send down there is crushed and fried to bits. Venus has an atmosphere thicker than earths oceans; even if you were to make it the right amounts of oxygen and co2 and reduce the temperature, humans wouldn't stand a chance. Air pressure counts big time, why do you think submarines can't go all the way down into the deepest parts of the oceans? It's because those subs would be crushed under the immense pressure. Think of you body on venus being like a sub in the mariana trench, dead meat.

seriously? Venus is to close to the sun, we don't have a technology to cool it down. Cooling isn't reducing the temperature. If you cool something down, you have to hear something up. We can do that in a fridge, but not planet wise. LOL

Colbya has a bit of a point, but there's something you're missing. Yes it's true that the biggest issue (besides breathing!) with deep diving is not the pressure overall, but the potential for *difference* in pressure. If you have sea level atmosphere in your lungs and you went 200 metres underwater, you're going to have a bad time. I don't know how deep the freediving record is, but most people would be very dead before they got that deep. So if you have gas in your lungs that is specially formulated to avoid high pressure solubility issues and is the same pressure as the water around you, you'll be ok.... to a point.

You see, the proteins in our cells actually are sensitive to pressure. One of the reasons it is so exciting to find really deep-sea creatures is because they use different chemistry to us, out bodies wouldn't be able to survive, even if we had SCUBA gear that could handle it.

The pressure at the Venusian surface though would be survivable. Great for flying kites, but really annoying for transportation.

Ottoich: there is one pretty easy way of cooling Venus that we do actually have the technology for: an umbrella. Seriously, though it would have to be ridiculously huge and in orbit. We would utilise radiative cooling, where Venus radiates its heat away into space and we reduce the amount of fresh energy it gets from the sun. In this case the other thing you are heating is space, so we don't mind too much. Plus there's loads of it :)

To actually do something useful with Venus would take quite a bit more effort. I'm looking forward to genetically engineered bacteria that will be able to survive the Venusian atmosphere and eat sulphuric acid. In my opinion that's the most plausible first step in terraforming Venus.

lord Venus is mostly co 2 and 800 % temp lol long dead before pressure becomes a problem lol
If the out side temperature is LIVABLE and the air mix correct a million pounds of pressure will not kill you wont even feal a thing wrong ( except the air is so dense it would be like walking under water you can breath .
As long as the pressure is the same inside your lungs - body and out side you dont get crushed nore harmed .
The air mix is changed drastically though in order to work .
A deep diver using pressurized tanks can go very very deep indeed the mix is like 90 % nirto and 5 % o2 .
BUT on assent the nitro can create bubbles in your blood blocking every thing killing you if you come up to fast .
look into deep diving .

Well, I learned something that I never knew. I knew about the deep diving thing but I always though that in space you would explode and on a high atmospheric pressure environment you would be crushed. But I guess if you can slowly increase pressure inside every cell in your body while slowly exposing yourself to ultra-high pressure, you could survive.

I think Nikka has a point with cooling venus. You wouldn't begin by cooling venus first though. Instead, you would focus on reducing the atmospher, and there are plenty of way to do that. The less atmosphere a planet has, the less heat it is able to hold on to. The only reason why venus is so hot is because it traps heat and doesn't let it go. Earth would probably get almost as hot if humans were to push it to that point.

Colbya I feel like you were correcting me but I was actually agreeing with you. My points about Venus being survivable was specifically about the pressure. However there was something you said in your last post that is incorrect: a million psi would actually kill you. The chemistry that keeps you alive would not work at those pressures. In fact, at something closer to 20,000 psi the chemistry of the proteins and enzymes that make you up changes and you'd die. The human body is incredibly resilient and can survive a really impressive array of pressures, but not that much.

Amorphus; you're right, you wouldn't explode in a vacuum. In fact you can survive in a vacuum for quite a bit longer than you'd expect. Numbers seem to change (possibly due to the lack of test subjects) but 30 seconds is very commonly quoted. I was being facetious about the umbrella, though still technically correct (the best kind of correct!). I agree with you - to a point. I think the most likely first act in terraforming Venus would be adjusting the atmosphere, but we may in fact need to cool the atmosphere before being able to do anything with it. I don't know this for a fact or anything of course. But if a biological agent were to be used to modify the atmosphere it may be the best course of action to cool it with a swarm of sunshades to prevent the terraforming organisms being cooked.

Amorphus said:Venus has an atmosphere thicker than earths oceans...

I'm going to pick you up on that one. The surface *pressure* on Venus is equivalent to being 900 metres underwater here on Earth, but the *density* of the atmosphere is 67kg/m^3, or 6.7% the density of water. I'm looking for the viscosity now.

OK, the viscosity of Venus' atmosphere at the surface is roughly twice that of sea level Earth's. I will confess now though that my area of study is plant biology and cell biology, not engineering or physics, so I'm not at all qualified to talk in depth about viscosity in gases.

humm did not think of the cem issues But my guess is we could find ways to deal with that .
even still 20,000 psi and earth being 14.5 psi Is a HUGE range .
Humm have to study the cem issue more .
As for Venus well being 800 % you better bring F 100 million sunscreen .
((((( You do know the first people down in the marinas trench used a diving bell right ?
its is well ill be lol 15,000 psi .