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 Description  | 
 Returns the number 42, which is the number of gallons in a barrel used to store petroleum products.  | 
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 Formula  | 
 GALLONS_PER_BARREL=42  | 
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 Parameters  | 
 none.  | 
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 Return Value  | 
 42  | 
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 Examples  | 
 gasVal = (HU# * GALLONS_PER_BARREL) * rGas  | 
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 Comments  | 
 Use this constant when you require the number of gallons in a barrel.  | 
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