Question

1 bar vacuum gauge is = ------- bar absolute
Select one:
O 1. 0.013
0 2. 1.013
O 3. 2.013
O 4. O​

Answer 1

Answer:

Although the difference between gauge and absolute readings are approximately 1 bar, you would very rarely simply add '1' to a gauge reading to get an absolute reading – by doing this you are creating an error due to the difference between the atmospheric pressure of the day and 1000mb, which could be up to 30mb

Answer 2

Answer:

Vacuum absolute is measured from a perfect vacuum in the positive direction. At ambient air pressure the vacuum reading will be the barometric air pressure, let's use 1.015 bar absolute as an example. If a suction pressure of 0.25 bar is applied the vacuum reading will be 0.765 bar absolute.