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Homework Help: Water Density & Altitude

  1. Sep 15, 2011 #1
    water has a density of 62.4lbm/ft^3 .How much does 2ft^3 of water weight at sea level and in Colorado where the altitude is 5374ft and the gravitational acceleration is 32.139ft/s^2?
    Solution :


    =4.015*10^3lbf (sea level)

    =4.011*10^3lbf (Colorado)

    is that correct???
  2. jcsd
  3. Sep 15, 2011 #2
    Yes it is.
  4. Sep 15, 2011 #3


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    Sorry, you are both wrong. According to your calculation, yenting, one cubic foot of water weighs about two tons.

    One lbm is equivalent to about 0.454 kg. One lbm also has a weight of one pound force when g = 32.174 ft/s^2.
  5. Sep 15, 2011 #4
    Thanks for checking SteamKing.

    I'll stick to metric, it's so much easier.

    So its the ratio 32.139:32.174 that gives the value of g. That makes much more sense.
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