Name the physical quantity which is expressed in the unit 'atm'. State its value in pascal.

A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change: increase, decrease or remains same, inside the (a) bell jar and (b) balloon ?

What is meant by the statement 'the atmospheric pressure at a place is 76 cm of Hg'? State it's value in Pa.

How is the barometric height of a simple barometer affected if it's tube is pushed down into the trough of mercury?