Pressures of a gas in cm of mercury

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The discussion revolves around calculating the pressure of a gas trapped by a column of mercury, specifically 5 cm. The key equation mentioned is Pressure = h * g * rho, where density is typically provided in exams. The user suggests that the pressure in the first case would be 76 + 5 cm, in the second case 76 - 5 cm, and in the last case remains at 76 cm. The consensus confirms that the user's calculations are correct. Understanding the relationship between gas pressure and mercury height is essential for solving such problems.
Richie Smash
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Homework Statement


Hello, I will post a picture here of a question.
It states, a column of air is trapped by 5cm of mercury as shown.
What is the pressure in cm of mercury in the gas in each case?

Homework Equations


Pressure= h*g*rho

The Attempt at a Solution


I would use that equation but usually density is given in these exams.
They state for the answer to be in cm of mercury,
So my guess is for the first one it’s 76+5cm
For the second it’s 76-5cm
And for them last one it’s 76 cm no change.

How do I figure this out?
 

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Your guess is correct.
 
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