The mercury in a barometer of cross-sectional area 1cm square has a height of 75cm. There is vacuum above it, of length 9cm.
What is the volume of air, measured at atmospheric pressure, that would have to be admitted to cause the mercury column to drop to 59cm?
The Attempt at a Solution
Should I use Boyle's Law, pV = constant?
Or Pressure = hpg? But problem is that I don't have the density of air?
Very confused, despite thinking for more than a day. Can anyone please kindly help?