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Pressure Measurement Problem 
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#1
Apr1105, 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?



#2
Apr1105, 06:05 PM

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P: 11,896

The first question is trivial.Use Pascal's formula.
Daniel. 


#3
Apr1105, 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? 


#4
Apr1105, 06:32 PM

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P: 11,896

Pressure Measurement Problem
No.It should be vacuum on top of the wine...
Daniel. 


#5
Apr1105, 06:34 PM

P: 40

I don't understand what you are saying.



#6
Apr1105, 06:40 PM

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P: 11,896

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. 


#8
Apr1105, 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.



#9
Apr1105, 06:58 PM

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P: 11,155

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. 


#10
Apr1105, 07:10 PM

P: 40

So is the answer 10.5?



#11
Apr1105, 07:36 PM

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P: 11,896

It should be a plus.But yeah,it's good.
Daniel. 


#12
Apr1105, 07:43 PM

P: 40

Is it good for mercury?



#13
Apr1105, 07:56 PM

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P: 11,896

What?That #?Nope,it's computed for wine.
Daniel. 


#14
Apr1105, 07:57 PM

P: 40

thanks for your help buddy...



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