00:01
Talking about an open -ended monometer and basically that is a way in which we use to measure pressure and you can talk about this in terms of distance in engine manifold where you can talk about it in terms of chemical actions or talk about it in terms of at the concept of mercury in the tube rising and that gives us different measures of pressure and so basically we've got a u -to -s shape hole that's connected to the gas manifold measures 76 .2 centimeters above the u -neck while the level that's open to the atmosphere is 23 .8 centimeters above the unit the outside atmosphere pressure in the lab is measured at 754 tour and what it's asking for is what's the pressure in the gas metaphor and then in terms of referencing this the density of mercury is 13 .5 -3 -3 -pmeillator at room temperature.
01:35
Then you have the choices i found somewhere else out there on the world of the internet that if you're given these as the choices to go ahead and solve for the new pressure within the manifold.
01:51
The first choice is 42, tor, choice b, 230, choice c, 272, choice d, 516, choice e, 712.
02:07
Well, there's a couple of ways to solve for this.
02:09
One is a little bit more complicated.
02:10
I'm going to share with that in just a minute.
02:12
Another is easier still.
02:15
First, converting 52 .4 centimeters, the difference in the height, into millimeters because millimeters of mercury.
02:22
If you have one millimeter of mercury, it's equivalent to one tour and pressure often because we started with the use of the fluid of mercury.
02:38
Compare the mercury to whatever the fluid is that we've got in the exhaust manifold.
02:43
So at any rate, we take the 524 now millimeters and then times that by the two different densities, the density of the new fluid, the non -volatile oil, 1 .088 divided by the density of the mercury to get a comparative ratio, and 1 .08 divided by 13 .533 is 0 .08, and then take that 524 times 0 .08, and you get 42 millimeters or 42 tour.
03:16
One of the choices is 42.
03:18
Well, well, you've also got to count in to put into consideration the atmospheric because it is an open ended.
03:27
So that one would not be a choice.
03:30
And these that are the 200 and something are too low of a choice.
03:35
So what we're left with is choice as d or with e.
03:39
And we start again with the open atmosphere of it being 754.
03:43
And then we're going to do something with the 42 in order to make it, i guess if you want to fit for the multiple choices.
03:50
Answers or comparing if you have one of the heights is a taller and it's on this outer part part that is open to the atmosphere or you could also potentially have kind of go in the other direction and having i think i drew that wrong but having where you start with a taller amount to begin with than comparative like this.
04:29
In other words, so if this was going to the exhaust manifold, if this was going to the exhaust manifold, there we go, that instead of having it where the one height starts us off, and it's the taller, having it taller here compared to here.
04:53
And this will make a little bit more sense here in just a moment.
04:56
Let me show some pictures to demonstrate what i'm talking about.
04:58
So here are the different pictures of monometers, and this is where i was showing one opening to the atmosphere and one connecting to a manifold.
05:14
And so you have a couple of different possibilities with this.
05:18
P1 is going to be equal to p2.
05:26
And here is yet one other image, and this is kind of just showing you once again, the connection to a gas manifold, and then having this word.
05:33
It's open to the atmosphere in a couple of possible situations...