Since you are dealing with pressure force per unit of area, you will also be dealing with weight per unit of volume-or density. When you talk about the density of a substance, you are talking about its weight per cubic foot or per cubic inch. However, to say that lead is heavier than water isn t a true statement. For instance, a 22-caliber bullet is the same density as a pail of water, but the pail of water is much heavier. It is true, however, that a cubic foot of lead is much heavier than a cubic foot of water.
Pressure depends on two principles-depth and density.
Every square foot of the sub s surface that is at that depth has a force of more than 6 tons pushing in on it. Obviously, the hull has to be very strong to withstand such pressures. Integrated Publishing's Official Web Page Click here for a current index of everything on this web site. All Rights Reserved.