Solve the all parts of following question:
Question: A pressure gauge reads 23.1 in Hg (inches of mercury) vacuum (i.e. -23.1 in Hg gauge). The barometer reads 76.0 cm Hg.
Part A: What is the pressure in the tank to which the pressure gauge is connected?
Part B: What is this pressure in kPa?
I want you to explain the physics in this problem. Thanks.