Pressures of a gas in cm of mercury

  • Thread starter Richie Smash
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In summary, the question is asking for the pressure in cm of mercury for a column of air trapped by 5cm of mercury. The equation to solve this is Pressure= h*g*rho, where density is usually given. The answer for the first case is 76+5cm, for the second case it is 76-5cm, and for the last case it is 76 cm.
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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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  • #2
Your guess is correct.
 
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What is the "Pressures of a gas in cm of mercury"?

The "Pressures of a gas in cm of mercury" is a unit of measurement commonly used to measure the pressure of a gas. It is defined as the pressure exerted by a column of mercury that is 1 cm in height at a standard gravity and atmospheric pressure.

How is "Pressures of a gas in cm of mercury" measured?

The pressure of a gas in cm of mercury can be measured using a device called a barometer. The barometer consists of a long glass tube filled with mercury, with one end closed and the other end open. The pressure of the gas is then measured by the height of the mercury column in the tube.

What is the relation between "Pressures of a gas in cm of mercury" and atmospheric pressure?

The "Pressures of a gas in cm of mercury" is directly related to atmospheric pressure. As atmospheric pressure increases, the height of the mercury column in the barometer also increases. Therefore, a higher atmospheric pressure will result in a higher pressure of the gas in cm of mercury.

Why is "Pressures of a gas in cm of mercury" commonly used in scientific experiments?

"Pressures of a gas in cm of mercury" is commonly used in scientific experiments because it is a precise and accurate unit of measurement for pressure. It is also a convenient unit to use, as it is easy to measure and convert to other units of pressure.

What are some other units of measurement for pressure?

Some other commonly used units of measurement for pressure include pascals, atmospheres, and pounds per square inch (psi). Each unit has its own advantages and is used in different fields of science and engineering.

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