2007-01-22 00:02:51 · 3 answers · asked by Chocolate Strawberries. 4 in Science & Mathematics ➔ Physics
The topic is pressure btw.
2007-01-22 00:04:02 · update #1
There are mercury vapours in the "vacuum" above the mercury; specifically there are enough to maintain dynamic equilibrium. When some mercury evaporates, other mercury condenses at the same rate so there is no apparent change.
2007-01-22 00:08:19 · answer #1 · answered by poorcocoboiboi 6 · 0⤊ 0⤋
It is the pressure of the air pressing down on the pool of mercury that raises a column of mercury.
Since the amount of air pressing down doesn't change (barring atmospheric changes) it doesn't matter how big the pool is so long as it is large enough to allow the column to form, so evaporation has no effect.
2007-01-22 00:21:54 · answer #2 · answered by Old guy 124 6 · 0⤊ 0⤋
Because the column and the reservoir are sealed.
2007-01-22 00:07:48 · answer #3 · answered by Timbo 3 · 0⤊ 0⤋