<PRE><B>Question 308822</B>
Calculate the volume of the 1 inch square x 1 mile column. 
Convert the 1 mile to feet since the density is in feet.
Convert the 1 inch square to 1 ft square also.
1 in*1 in*(1 ft/12 in)^2=1/144 ft^2
1 mile=5280 ft
{{{V=A*h=(1/144)(5280)}}}
{{{V=36.67}}} ft^3
Find the weight of the column by multiplying the volume and the density of water. 
{{{W=VA=36.67*59.52}}}
{{{W=2182.6}}} lbs
That weight acts on the 1 inch square area.
{{{P=2182.6/1}}}
{{{P=2182.6}}} psi or about 148 atmospheres. </PRE>