What is datum level?

Q.  In deadweight gauge, weights are added on the top of piston until the piston reaches a datum level. The datum level is known as
- Published on 10 Sep 15

a. Null point, where the downward force balances the fluid pressure
b. Lowest point of the container
c. Highest level of fluid in the container
d. None of these

ANSWER: Null point, where the downward force balances the fluid pressure

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