Register to reply

Pressure Measurement Problem

by imnotsmart
Tags: measurement, pressure
Share this thread:
imnotsmart
#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?
Phys.Org News Partner Science news on Phys.org
Wildfires and other burns play bigger role in climate change, professor finds
SR Labs research to expose BadUSB next week in Vegas
New study advances 'DNA revolution,' tells butterflies' evolutionary history
dextercioby
#2
Apr11-05, 06:05 PM
Sci Advisor
HW Helper
P: 11,896
The first question is trivial.Use Pascal's formula.

Daniel.
imnotsmart
#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
#4
Apr11-05, 06:32 PM
Sci Advisor
HW Helper
P: 11,896
Pressure Measurement Problem

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

Daniel.
imnotsmart
#5
Apr11-05, 06:34 PM
P: 40
I don't understand what you are saying.
dextercioby
#6
Apr11-05, 06:40 PM
Sci Advisor
HW Helper
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.
Gokul43201
#7
Apr11-05, 06:43 PM
Emeritus
Sci Advisor
PF Gold
Gokul43201's Avatar
P: 11,155
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
#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
#9
Apr11-05, 06:58 PM
Emeritus
Sci Advisor
PF Gold
Gokul43201's Avatar
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.
imnotsmart
#10
Apr11-05, 07:10 PM
P: 40
So is the answer -10.5?
dextercioby
#11
Apr11-05, 07:36 PM
Sci Advisor
HW Helper
P: 11,896
It should be a plus.But yeah,it's good.

Daniel.
imnotsmart
#12
Apr11-05, 07:43 PM
P: 40
Is it good for mercury?
dextercioby
#13
Apr11-05, 07:56 PM
Sci Advisor
HW Helper
P: 11,896
What?That #?Nope,it's computed for wine.

Daniel.
imnotsmart
#14
Apr11-05, 07:57 PM
P: 40
thanks for your help buddy...
Gokul43201
#15
Apr11-05, 08:01 PM
Emeritus
Sci Advisor
PF Gold
Gokul43201's Avatar
P: 11,155
Remember, you used the density of wine, not the density of mercury.


Register to reply

Related Discussions
QM Measurement Problem General Physics 26
The Measurement Problem: the return :-) Quantum Physics 2
The measurement 'problem' Quantum Physics 8
The measurement problem General Physics 7