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If you are boiling water at 100 feet below sea level, you must be in a submarine.

The interior pressure of a submarine is about sea level, so water would boil at 212F or 100C.

Another Answer

The submarine answer above is quite correct. Most submarines run near sea level pressure on the inside because otherwise you would have an issue with the bends upon surfacing and opening a hatch.

However, let's consider an air filled chamber that is 100 feet below sea level, and that is equalized so that the air pressure inside is the same as the water pressure outside. Actually, such chambers do exist - take for example the 100- foot submarine escape training towers at HMNB Portsmouth, HMAS Stirling on Garden Island, and New London CT, among others.

We know that the pressure of water at some depth is given by p = gdh, where p is pressure, g is gravity, d is density, and h is depth. Plug in for 100 feet (about 30 meters) and you get (9.81 m s-2) (1 g m-3) (30.48 m) or 299 kg s-2 m-1, or 299 KPa.

Now, to find the boiling point of water at 299 KPa, we consult the steam table for water, and we discover that water boils there at about 132 C, or about 270 F.

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