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Water Data and Formulas
 

• 1 gallon of water = 231 cubic inches = 8.333 pounds
  
  
• 1 pound of water = 27.7 cubic inches
  
  
• 1 cubic foot of water = 7.5 gallons = 62.5 pounds
  (salt water weighs approximately 64.3 pounds per cubic foot)
  
  
• pounds per square inch at bottom of a column of water =
  (height of column in ft.)  x   (0.434)