An open-tube mercury manometer is joined to a gas line.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
An open-tube mercury manometer is joined to a gas line. The mercury stands higher in the open arm. Find the gauge pressure and the absolute pressure of the gas. (Mercury , air , .)
Need a reminder? The key ideaShow
The air presses with , the pressure of of mercury, at sea level. Gauge pressure is the pressure above the air's; absolute pressure includes it. An open manometer reads from the difference of its levels.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Gauge. .
Step 2. Absolute. .
Answer: gauge; absolute.
Check. of mercury is about a fifth of an atmosphere.
Watch out. Higher in the open arm means the gas is above air pressure.
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