00:02
So in this problem, we've been asked to find p gas in atmospheres.
00:11
We're using an open ended man, ometer, which is pictured here, and we're given that atmospheric pressure is equal to 738.5 tour.
00:28
We are also given the change in height of the mercury is 2.35 centimeters.
00:41
So if we view the diagram, we can tell that the gas pressure is less than atmospheric pressure.
01:00
And we can tell this because of the liquid mercury, we can see that the liquid mercury is lower on the side of the atmospheric pressure than it is on the side of the gas pressure.
01:22
So the gas pressure is less than exerting less force onto the mercury than the atmospheric pressure is.
01:41
So this tells us that in order to find our guest pressure, all we need to dio is take the atmospheric pressure which was given to us and subtract the change in height.
02:07
If this had been the other way around, where the gas was greater than the atmospheric pressure, we would simply be adding the change in height instead.
02:24
Now our atmospheric pressure has been given to us as 7 38.5 tour, but we are working here in millimeters of mercury.
02:40
So you may recall that one tour is equal 21 millimeter off mercury.
03:01
So it's a simple one.
03:03
Toe one conversion, 738.5...
4 comments
Melvin B.
May 4, 2023
thanks for breaking down the gas pressure problem, michelle!
Eric Z.
July 4, 2023
Super grateful for the clear explanation Michelle
Tamara A.
August 25, 2023
Appreciate the detailed walkthrough Michelle!
Cathy H.
October 13, 2023
Big thanks for simplifying the gas pressure concept, Michelle!