Answer :
Final answer:
Gauge pressure is the difference between a pressure value and atmospheric pressure, with negative pressure indicating values below atmospheric pressure. Atmospheric pressure is influenced by various factors and is a measure of absolute pressure relative to sea level.
Explanation:
Gauge Pressure is the pressure relative to atmospheric pressure. It is positive for pressures above atmospheric pressure and negative for pressures below it. For example, when a value of pressure in everyday life is mentioned, like the recommended tire pressure, it is often referring to gauge pressure.
When pressure is less than atmospheric, it is referred to as negative pressure. In the context of ventilation systems, negative air pressure signifies a gauge pressure below atmospheric pressure.
Atmospheric pressure is affected by factors like altitude, temperature, and air composition. It is a measure of absolute pressure due to the weight of air molecules above a certain height relative to sea level.
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