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bak3donh1gh t1_iy2trwn wrote

Reply to comment by bumpyclock in TIL More than 80 percent of the ocean has never been mapped, explored, or even seen by humans and as a result, we know more about the surface of Mars than Earth by [deleted]

A vacuum has 1atm of pressure? I think you should check your numbers.

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MannishSeal t1_iy2urgw wrote

No they said "differential". There is a 1 atm pressure differential between the vacuum of space and earths atmosphere.

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bumpyclock t1_iy2vhti wrote

I said pressure differential. Earth has 1 atm, space has 0.

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bruinslacker t1_iy2y3os wrote

I think he means the pressure differential between space and your body. Most of the time there is about 1 atm of pressure pushing against your body. To avoid expanding or shrinking your body pushes back at approximately 1 atm. If you were suddenly flung into space the pressure inside your body would still be about 1 atm but the pressure outside would be nearly 0.

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Nothammer t1_iy2u9y9 wrote

There's actually a little pressure in space. But not 1 atm for sure.

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bak3donh1gh t1_iy2ujmh wrote

Space is relative. So yeah a little pressure surrounding the earth, surprisingly far away as well. But it the space between galaxies I'm gunno go with no pressure. As this video will teach(I did not actually watch the whole video)

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Nothammer t1_iy2uvlm wrote

Even I between galaxies there are molecules from time to time. Space is nearly a perfect vaccum though and we're talking in absolute miniscule amounts of pressure here. It's absolutely negligible, but it's technically a liiiittle pressure.

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Vertebrae_Viking t1_iy36aik wrote

Technicalities like this are to be ignored if you don’t want to piss off a random physicist.

Edit: medics don’t care about outer space.

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Schuben t1_iy3nayb wrote

Like a general practicioner or are we talking about specialists?

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jkmoule t1_iy2utag wrote

They mean the differential is 1atm in space. Because it's 1atm of pressure within earth's atmosphere at sea level, but is nearly 0atm in the vacuum of space, so the pressure differential is 1atm.

Meanwhile, pressure increases by 1atm roughly every 10m of depth in the ocean. The average ocean depth is 3700m, so a pressure of about 370atm. The pressure differential between the surface and that is 369atm, far larger than the 1atm differential between the surface and the vacuum of space.

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