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Water Density & Altitude

by yenting
Tags: altitude, density, water
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yenting
#1
Sep15-11, 02:14 AM
P: 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 :

density=mass/volume
62.4lbm/ft^3=mass/2ft^3
mass=124.8lbm

w=mg
=124.8lbm*32.174ft/s^2
=4.015*10^3lbf (sea level)

w=mg
=124.8lbm*32.139ft/s^2
=4.011*10^3lbf (Colorado)

is that correct???
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apelling
#2
Sep15-11, 02:56 AM
P: 70
Yes it is.
SteamKing
#3
Sep15-11, 08:49 AM
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P: 6,471
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.

apelling
#4
Sep15-11, 10:28 AM
P: 70
Water Density & Altitude

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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