Pressure Measurement Problem


by imnotsmart
Tags: measurement, pressure
imnotsmart
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#1
Apr11-05, 05:40 PM
P: 40
Blaise Pascal duplicated Torricelli's barometer using a red Bordeaux win, of density 984 kg/m^3, as the working liquid. What was the height of the wine column for normal atmospheric pressure? Would you expect the vacuum above the column to be as good as for mercury?
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dextercioby
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#2
Apr11-05, 06:05 PM
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The first question is trivial.Use Pascal's formula.

Daniel.
imnotsmart
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#3
Apr11-05, 06:31 PM
P: 40
So that is P=Po+(row)(g)(h)
P=1.013*10^5+(984kg/m^3)(9.8)(h).....is this correct?

dextercioby
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#4
Apr11-05, 06:32 PM
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Pressure Measurement Problem


No.It should be vacuum on top of the wine...

Daniel.
imnotsmart
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#5
Apr11-05, 06:34 PM
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I don't understand what you are saying.
dextercioby
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#6
Apr11-05, 06:40 PM
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I'm saying that the experiment should be the same as in the case of Torricelli,but the length of the tube be >14 times bigger.

Daniel.
Gokul43201
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#7
Apr11-05, 06:43 PM
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Quote Quote by imnotsmart
So that is P=Po+(row)(g)(h)
P=1.013*10^5+(984kg/m^3)(9.8)(h).....is this correct?
What is P in this equation ?
imnotsmart
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#8
Apr11-05, 06:56 PM
P: 40
P is suppose to be the pressure, but im not sure what that is...I don't get this problem at all.
Gokul43201
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#9
Apr11-05, 06:58 PM
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There is no other P involved.

On one side of the column, you have atmospheric pressure (Po). On the other side, you have vacuum (P=0). So, the force due to the liquid column must balance the force due to the atmosphere.
imnotsmart
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#10
Apr11-05, 07:10 PM
P: 40
So is the answer -10.5?
dextercioby
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#11
Apr11-05, 07:36 PM
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It should be a plus.But yeah,it's good.

Daniel.
imnotsmart
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#12
Apr11-05, 07:43 PM
P: 40
Is it good for mercury?
dextercioby
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#13
Apr11-05, 07:56 PM
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What?That #?Nope,it's computed for wine.

Daniel.
imnotsmart
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#14
Apr11-05, 07:57 PM
P: 40
thanks for your help buddy...
Gokul43201
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#15
Apr11-05, 08:01 PM
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Remember, you used the density of wine, not the density of mercury.


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