The Pressure less than Atmospheric Pressure is Known as

Answer: 4- vacuum pressure

The pressure less than atmospheric pressure is known as vacuum pressure.

Explanation:

• 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

P_abs=P_atm+P_gauge

Vacuum pressure = Atmospheric pressure - Absolute pressure

P_vac=P_atm-P_abs

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