what would the atmospheric pressure be like below sea level?

Answer 1

The atmosphere only extends to sea level, the pressure increase below that is due to the weight of the sea water. So the maximum atmospheric pressure is at sea level.

Answer 2

There are a few places on earth that the land is below sea level, and on average the air would be a little more dense than sea level, but the difference is easily lost in the normal fluctuation of the barometric pressure of normal weather paterns.

However, if you're talking about a structure below the sea:

A closed vessel, such as a submarine, can mantain about any barometric pressure desired.

If you had a structure that has a room open to the sea, so persons can dive in and swim out into the ocean, then the atmosphereic pressure must match the pressure of the ocean at the level of the opening. And that can get high.

Answer 3

Do you mean atmospheric pressure in places that are below sea level? Or are you referring to pressure in the ocean.

If the former, yes, air pressure will by generally higher the more atmosphere you have over your head.

If the latter, it is not atmospheric pressure. You can add the equivalent of atmospheric pressure for every 10 metres you submerge, so that when you dive to 10m you have the equivalent of 2 atmospheres pressure on you.

At 50m, you have 6 atmospheres pressure on you. If you take a deep breath from your tank at that depth, then surface without breathing out, the air in your lungs will expand five-fold and blow your lungs through your rib cage.

PS - I think this dik hed is giving a thumbs down to every answer he gets. What a tosser.

Answer 4

Atmospheric pressure is greater below sea level than at or above it. If you are cooking at the bottom of Death Valley, CA, the boiling point of water is higher than at Denver, CO.

Additional comment:
It's funny that at this moment the only answer with a "thumbs up" is the wrong answer and the majority of answers with a "thumbs down" are right. If you research a little you will find that this answer and several other are indeed correct. This farther one travels above sea level, the lower the atmospheric pressure and inversely the deeper below sea level, the higher the pressure is. (barometric variance not taken into account)
Since you did not say "under the sea" It is presumed you did not mean underwater.
Air has weight, about a pound/100 cubic feet. This issue concerns the weight of a column of air. More air above a column, more weight and pressure at the bottom of that column.

Answer 5

The deepest land place on Earth is the Dead Sea. The atmospheric pressure there is so high that the salt of the sea is pushed into the soil. It is extruded around the sea as those salt columns (a la Lot's wife).

Atmospheric pressure is noticeably higher below sea level.

Answer 6

Correcting what Tycha wrote:

The salt has not been pushed into the soil by high air pressure, near the Dead Sea. The Dead Sea, having no outlets, becomes a sink for all of the salt in the water that enters it. When the rate of evaporation increases, the amount of water entering the sea decreases because of increasing aridity or both, the sea will retreat, leaving behind the salt that comes out of solution. This would happen at any elevation.

Note the high altitude Bonneville Salt Flats in Utah.

Answer 7

There are a few places on Earth that are below sea level. Death Valley in California, the shores of the Dead Sea in the middle east. The pressure there is slightly higher than at sea level. I think it goes down about 1 inch or mercury for each thousand feet you go up, so I suppose it goes up that much for each thousand feet below sea level.

Answer 8

An altimeter works on the same priciple as a barometer, except you are using changes in air pressure to indicate changes in altitude rather than changes in weather. As you gain altitude, the pressure drops. As you lose altitude, the pressure rises. Below sea level, assuming you are in a sea-free area, the pressure continues to rise at the same rate.

The shore of the Dead Sea is the lowest dry place on Earth, 1300 feet below sea level. The air is noticeably denser there, as is the oxygen content. The typical air pressure is 31.3 in Hg. (29.9 at sea level).

Answer 9

The atmospheric pressure below sea level is rarely found on earth. It will just be like the pressure which is found while at the mountain peak. Lesser the pressure, the less the oxygen. It is bearable upto a certain height on a mountain. As we go higher in the mountain, the pressure decreases.

Answer 10

You could see for yourself if you wanted to. Just visit
New Orleans, La., and suburban Los Angeles, Ca.
Most of New Orleans is below sea level, and large parts
of Los Angeles, Ca. are also below sea level although
it was not widely published until recently.