railway RRB JE (CBT I + CBT II) Mock Test 2024 Fluid Mechanics Pressure Measurement

Which of the following is correct?

1
Absolute Pressure = Atmospheric Pressure + Vacuum Pressure
2
Absolute Pressure = Atmospheric Pressure - Vacuum Pressure
3
Absolute Pressure = Atmospheric Pressure × Vacuum Pressure
4
Absolute Pressure = Atmospheric Pressure / Vacuum Pressure
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