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?

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

How is the barometric height of a simple barometer affected if it's tube is slightly tilted from vertical?