Subject: Weight of water

Phillip Colla (
Sat, 19 Jun 1999 15:48:12 -0700

>What is the weight in pounds of a cubic foot of tap water?  I do not
>need high accuracy.  To the nearest tenth of a pound would be fine.

The density of water is 1.00000 gm/ml at 3.98 degrees C.
To convert to weight at sea level, you can use the conversion

   1000 ml / liter
   .03531467 cubic foot / liter
   .0022046226 pounds / gram

Thus, the expression

(1.00000 gm/ml) (1000 ml/liter) (.0022046226 pounds / gram) 
            (.03531467 cubic foot / liter) 

yields the weight of water in the units you want.

I'll let you do the math, just to keep you honest.
You can find these expressions all over the web or
in any chemistry or physics reference book.

Best regards,

Phillip Colla
Research Associate: