Originally posted by poet1b
reply to post by ahnggk
Don't forget that the warming of deep ocean waters is also causing them to expand.
The real kicker is to multiply that .3 psig by a thousand square miles. Than one can see how much force is at play. We are talking hydraulics here.
How many sq inches are in a sq mile?
Just off the coast of Sumatra is the Java Trench, and the ocean drops down very quickly, with a huge cliff/massive wall.
The Sunda Trench, earlier known as, and sometimes still indicated as the Java Trench, located in the northeastern Indian Ocean, with a
length of 2,600 kilometres (8,500,000 ft) and a maximum depth of 7,725 metres (25,344 ft) (at 10°19'S, 109°58'E, about 320 km
south of Yogyakarta), is the deepest point in the Indian Ocean.
I don't know how much pressure a warming and therefore expanding ocean puts up against such a massive wall/surface, but a few tenths of pressure per
square inch would add up to a great deal of total pressure. Nobody else is talking about this, but it wouldn't be the first time I came up with a
point that others have overlooked.
Take a fish tank and fill it with water to the top. That's your current sea level.
Now continue to add water to it. What happens? Do the sides of the fish tank crack, part or rupture from adding volume to the fish tank?
No, it does not. The water flows out over the top. The "sea level" rises. If you buried the fish tank in the ground to where it's top is level with
the ground and did the same thing with it, the water would simply flow out of the tank and flood the surrounding areas, but it does not add pressure
to rupture the tank.
Get a pot and fill it with water and place on the stove. Have the fill level to almost full and heat the water.
Heating the water will cause it to expand, and if you heat it to boiling, it can "boil over" out the top. But it will not crack, bend or rupture the
pot in any way, because the expanding water has a place to go: over the lip of the top of the pot.
Now, if you repeat the above examples, only you seal the top of the fish tank and rigged it to still have water to it...yes, it would crack, break or
push the sides out.....or if you used a pot like a pressure cooker that seals the top, and you seal the steam valve on it, it can explode from the
pressure that builds up (only in the case of the pressure cooker, it's steam pressure doing it).
However, the good news is our oceans are not sealed in. Add more water to them and they spill on to the land that is not normally underwater (sea
levels rise). You see this all the time with tides. Heat the water to expand (and to really expand you'd have to heat the oceans by a LOT more than
just a few degrees), it would still spill over.
Water's density is 1.0 g/cm^3 where as say basalt rock's density is almost 3.0 g/cm^3. Even glass has a density of 2.4-2.8 g/cm^3.
So the only thing that would increase pressure would be to increase the depth of the water (as you mentioned, rising sea levels).
would need to drastically change to increase any pressure, even at the deepest parts of
the oceans, and even then, the amount of pressure change would be so small that it would be insignificant compared to the pressures that the crust
itself places on plate faults, and the pressures actually below the crust.