Assertion (A) : The walls of a dam are made thicker at the bottom.

Reason (R) : Pressure is the same in all directions about a point inside the liquid.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

Assertion (A) : A hydraulic jack is used for squeezing oil out of linseed and cotton seeds.

Reason (R) : It works on the Pascal's principle.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

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

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