Write the numerical value of the atmospheric pressure on the surface of the earth in pascal.

What physical quantity is measured in torr? How is it related to the S.I. unit of the quantity?

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 the purpose of a barometer?