What is the height of the wine column in Pascal's barometer?

[imnotsmart]

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?

 

[dextercioby]

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

Daniel.

 

[imnotsmart]

So that is P=Po+(row)(g)(h)
P=1.013*10^5+(984kg/m^3)(9.8)(h)...is this correct?

 

[dextercioby]

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

Daniel.

 

[imnotsmart]

I don't understand what you are saying.

 

[dextercioby]

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]

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]

P is suppose to be the pressure, but I am not sure what that is...I don't get this problem at all.

 

[Gokul43201]

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]

So is the answer -10.5?

 

[dextercioby]

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

Daniel.

 

[imnotsmart]

Is it good for mercury?

 

[dextercioby]

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

Daniel.

 

[imnotsmart]

thanks for your help buddy...

 

[Gokul43201]

Remember, you used the density of wine, not the density of mercury.