Answer: 4- vacuum pressure
The pressure less than atmospheric pressure is known as vacuum pressure.
- Absolute pressure- The pressure difference is known as absolute pressure when absolute zero is chosen as the datum.
- Gauge pressure- The gauge pressure is the pressure that exists when the pressure is greater than the atmospheric pressure.
- Vacuum pressure-The vacuum pressure is the pressure that exists when the pressure is lower than the atmospheric pressure.
The relationship between the pressures is given by,
Absolute pressure = Atmospheric pressure + Gauge pressure
Vacuum pressure = Atmospheric pressure - Absolute pressure
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