# Pressure Measurement Problem

by imnotsmart
Tags: measurement, pressure
 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?
 Sci Advisor HW Helper P: 11,928 The first question is trivial.Use Pascal's formula. Daniel.
 P: 40 So that is P=Po+(row)(g)(h) P=1.013*10^5+(984kg/m^3)(9.8)(h).....is this correct?
 Sci Advisor HW Helper P: 11,928 Pressure Measurement Problem No.It should be vacuum on top of the wine... Daniel.
 P: 40 I don't understand what you are saying.
 Sci Advisor HW Helper P: 11,928 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.
Emeritus
PF Gold
P: 11,155
 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 ?
 P: 40 P is suppose to be the pressure, but im not sure what that is...I don't get this problem at all.
 Emeritus Sci Advisor PF Gold 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.
 P: 40 So is the answer -10.5?
 Sci Advisor HW Helper P: 11,928 It should be a plus.But yeah,it's good. Daniel.
 P: 40 Is it good for mercury?
 Sci Advisor HW Helper P: 11,928 What?That #?Nope,it's computed for wine. Daniel.
 P: 40 thanks for your help buddy...
 Emeritus Sci Advisor PF Gold P: 11,155 Remember, you used the density of wine, not the density of mercury.

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