A long tube filled with mercury is turned upside down into a small dish of mercury. The mercury level inside the tube drops, so a vacuum remains at the top. When atmospheric pressure falls, which length becomes smaller?
- APQ
- BPS
- CQR
- DRS
Physics 5054 · O Level · Pressure
A long tube filled with mercury is turned upside down into a small dish of mercury. The mercury level inside the tube drops, so a vacuum remains at the top. When atmospheric pressure falls, which length becomes smaller?