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TBR Example 6.15
What is the pressure in atmospheres of a column of gas in a closed tube above mercury if the height difference at sea level between a connected column of mercury open to the atmosphere and the closed column above mercury is 317 mm?
The answer is 0.583atm
In the explanation they mention that since the Height difference (delta H) is 317, the pressure difference (delta p) is also 317. From there they said the answer could be either 760torr-317torr =443torr or 760+317torr=1077torr but the answer choices only have 443torr so that is what is chosen as correct.
I don't understand how Height Difference EQUALS Pressure Difference. I thought the equation for Pressure difference was: Delta P = (Density)(g)(Height Difference). So How can we take 317 for Pressure difference directly?
EDIT: I think I figured it out. Since this manometer uses Mercury, one mm of height difference is equal to 1 torr. Therefore we can easily convert between Height and Pressure difference. Is this theory correct?
What is the pressure in atmospheres of a column of gas in a closed tube above mercury if the height difference at sea level between a connected column of mercury open to the atmosphere and the closed column above mercury is 317 mm?
The answer is 0.583atm
In the explanation they mention that since the Height difference (delta H) is 317, the pressure difference (delta p) is also 317. From there they said the answer could be either 760torr-317torr =443torr or 760+317torr=1077torr but the answer choices only have 443torr so that is what is chosen as correct.
I don't understand how Height Difference EQUALS Pressure Difference. I thought the equation for Pressure difference was: Delta P = (Density)(g)(Height Difference). So How can we take 317 for Pressure difference directly?
EDIT: I think I figured it out. Since this manometer uses Mercury, one mm of height difference is equal to 1 torr. Therefore we can easily convert between Height and Pressure difference. Is this theory correct?
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