XPost: sci.space.policy, sci.physics
From: fjmccall@gmail.com
Alain Fournier wrote:
>On Oct/13/2016 at 10:53 AM, Fred J. McCall wrote :
>> Serigo wrote:
>>
>>> On 10/12/2016 7:41 PM, Fred J. McCall wrote:
>>>> Serigo wrote:
>
>>>>> it is still too costly, and there is no payoff, just rocks and sand in a
>>>>> vaccum
>>>>>
>>>>
>>>> We already established that your "rocks and sand in a vacuum" is
>>>> false.
>>>>
>>>
>>> rong, it is not a true or false game.
>>>
>>
>> Of course it is. It's either a vacuum or it isn't.
>>
>>>
>>> Compaired to Earths atmosphere, Mars is more like outter space, a vacuum.
>>>
>>
>> Not the definition of 'vacuum'. By your definition Creed, Colorado,
>> is a 'vacuum', since the atmospheric pressure there is closer to space
>> than it is to sea level.
>
>Of course Mars' atmosphere isn't a vacuum. But atmospheric pressure at
>Creede, Colorado is closer to 101.3 kPa than to 0. It is about 73kPa.
>Extremely few long term human settlements have existed high enough to be
>below half of atmospheric pressure at sea level. Only 6 mountains in
>North America are high enough to have an average pressure less than half
>of the average pressure at sea level. They are all in Alaska, Yukon and
>Mexico. And none are inhabited.
>
Crap. The graph I looked at was in meters (and didn't label units) I
wish people wouldn't do that. I should have noticed, though, that the
pressure fall off was much too rapid, so my bad too.
OK, rewrite. Half the atmospheric pressure is gone at around 5500
meters above MSL (when compared to MSL pressure). That's about 18,000
feet. The city of La Rinconada in Peru is at 16,732 feet, so humans
can damn near live in vacuum. It's at around 55% sea level pressure.
--
"Insisting on perfect safety is for people who don't have the balls to
live in the real world."
-- Mary Shafer, NASA Dryden
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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