OpenStudy (anonymous):

Help Help please!!! A manometer has a sample of gas in one end and is open to the atmosphere on the other end. The atmospheric pressure is 760 mm Hg. The difference in mercury levels is 60 mm (the mercury is lower on the side open to the atmosphere). What is the pressure of the gas? Select one: a. 700 mm Hg b. 820 mm Hg c. 760 mm Hg d. 60 mm Hg

3 years ago
OpenStudy (joannablackwelder):

An open tube manometer measures the pressure of a gas as compared to atmospheric pressure by measuring the change in height of the liquid in between. The side that is lower has a higher pressure.

3 years ago
OpenStudy (joannablackwelder):

The height difference is the pressure difference.

3 years ago
OpenStudy (joannablackwelder):

So, the pressure of the gas is atmospheric pressure - height change. Make sense, @denisse18 ?

3 years ago
OpenStudy (anonymous):

i think B??

3 years ago
OpenStudy (joannablackwelder):

No, that's not what I get. Since the mercury is lower on the side of the atmosphere, the pressure of the atmosphere is higher than the pressure of the gas.

3 years ago
OpenStudy (anonymous):

so is D because not is A,B and C

3 years ago
OpenStudy (joannablackwelder):

Hm, how do you know it's not A, B, or C?

3 years ago
OpenStudy (anonymous):

A and C is incorrect because a teacher told me, and you told me that the B is incorrect then only offer me the option is D

3 years ago
OpenStudy (joannablackwelder):

Hm, that's weird. Because I get A.....

3 years ago
OpenStudy (anonymous):

no A is incorrect

3 years ago