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a lot
about 5000 thousand mm.
Depends on the size of the foot - a child's food will take far less pressure to crush than an adult man's foot.
Full can? Average should be about 200-250 lbs pressure.
it takes 76 lbs of pressure to collapse/crush one's windpipe
2,500 pounds of pressure
The wolf jaw can produce 3,200 psi pressure which inables it to crush bones and such.
The hull of the submarine will crush or give way if the pressure of the water is too much.
It's totally dependent on the hull type, material construction, and overall design, but in general, just before a submarine reaches crush depth is as much sea pressure as it can handle.
The size of the Adams apple isn't directly related to the depth of your voice. (If it is at all) my voice is deeper than 98% of white males but I have a smaller Adams apple than most people. If you're over 16 it probly won't get much deeper. But it is possibe that it will. It varries from person to person.
First, this would be a tragic waste of a gemstone, if that's the one you want to crush. Diamonds are hard, they are not 'strong'. You may be able to shatter a diamond with a hammer.
Not sure, but too much apple can put their blood pressure up.