To Determine the Greatest Depth in Water at which One Can Breathe through a Tube

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Abstract
A simple expt. is described to demonstrate the fact that at a depth of approx. 5 ft. hydrostatic pressure is sufficient to prevent inhalation. The air pressure above the water in a vertical glass tube is reduced by a normal inhalation. The height of rise of the water is equal to the depth to which the unprotected chest may be submerged in water before breathing through a tube becomes impossible.

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