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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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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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