Flow between two connected points requires which condition?

Flow between two connected points requires which condition?

• A. Equal pressures
• B. No flow
• C. High humidity
• D. A pressure differential exists

Answer: (D)

Flow happens when there is a pressure difference that pushes the gas from the higher-pressure side to the lower-pressure side. If the pressures are the same, there’s no driving force, so no net flow occurs. The amount of flow depends on how big that differential is and how much resistance the path offers. Humidity isn’t what initiates flow; it affects moisture in the air but doesn’t create a pressure gradient. So, the condition that allows flow is a pressure differential.

Flow happens when there is a pressure difference that pushes the gas from the higher-pressure side to the lower-pressure side. If the pressures are the same, there’s no driving force, so no net flow occurs. The amount of flow depends on how big that differential is and how much resistance the path offers. Humidity isn’t what initiates flow; it affects moisture in the air but doesn’t create a pressure gradient. So, the condition that allows flow is a pressure differential.