3 ms·
But the additional pressure the sub has to counter is 1atm.
by wicknicks 13y ago
But the additional pressure the sub has to counter is 1atm.
- mischanix 13y agoI'm curious, is that force (2atm:1atm) linear (= 1atm:0atm) or exponential (< 1atm:0atm)?
- m4rkuskk 13y agoIt's linear. The surrounding pressure increases by the following: P=γ*h P=pressure (lb/ft^2) h=height (ft) γ=density (lb/ft^3) water = 62.4lb/ft^3 So if he goes down 33ft, the pressure @33ft will be: Total pressure: 62.4x33 = 2059psf (1atm ≈ 2116.21psf)
- deleted 13y ago[deleted]
- uvdiv 13y agoWhat physically matters is the pressure difference. 2atm:1atm and 1atm:0atm are the same -- they both exert 1.03 kg-force per square centimeter of wall. If you're asking how does pressure change with depth, it's linear for water. The pressure is just the sum weight of the column of fluid above you. Since water is (basically) incompressible, the density is the same at any depth, so, the fluid weight is proportional to the column height. At ~10 meters, it's 1.03 kgf per cm^2 or 1 atmosphere (on top of one atmosphere of air above, for 2 atmospheres total). It's the opposite for air. That's a compressible gas, so density increases with pressure, which makes pressure an exponential function of altitude. A packet of air is compressed by the air above it, which makes it denser (more mass/volume), so that the pressure below increases at a steeper rate.
- mischanix 13y agoThanks for the explanation. I wasn't intuiting the difference between air and water.
- Lost_BiomedE 13y agoSo is it implied that he tests on the surface by creating a vacuum inside the sub?
- isaacb 13y agoOr even easier, just submerge it without a person inside and see how deep it can go.