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Since it would probably be tempered glass, 100lbs. of pressure.
Take your hands and grab each end of the stick. Then put your knee under the middle and push down with your hands . Kind of like when you break a stick. Hope I Answered your question (:
Look on Mythbusters. They have a whole episode about duct tape.
It is not so much as how much pressure as where the pressure is applied. If you keep the egg upright and try to apply pressure at the top and bottom, the egg won't break as easily as much as when you apply it in the middle. The shape of the egg gives greater tensile strength to the ends but the middle is comparitively fragile.
They must be stamped on a label on side what max pressure.
This depends on which way you are pushing. Your knee is a hinge joint and is made to flex and extend one way only. Pushing the hinge in the other way can be catastrophic and could be broken from upwards of 30 pounds.
Since it would probably be tempered glass, 100lbs. of pressure.
500
I heard it only takes 15 pounds of pressure (was told this from a 26 time World Champion Armwrestler).
The amount of pressure that it takes to break an arm depends on the strength of the arm and the angle in which the pressure is applied. On the average, it takes 120 pounds of pressure.
50 psi
the amount of pressure created when you face plant on concrete
Knee joint pain has many different causes and each cause has a different treatment. If your brother is overweight, loosing weight will take a great deal of pressure off the knee. Also, good shoes and strengthening exercises can go a long way towards alleviating knee pain.
550 lbs. of pressure
75 pounds of succinct concentrated opposing downward pressure will break almost any human bone
It would only take about 30 pounds of pressure per square inch to break a human neck. At 25 pounds of pressure, it causes instant unconsciousness.
You probably have too twist and do alot of stuff to it, but, it will get swollen up.