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The stack effect drives natural ventilation because warm air inside the building is

  • A.at a higher pressure at every height
  • B.saturated with moisture and therefore heavier
  • C.less dense than the outside air and rises
  • D.more dense than the outside air and falls

Answer: C

Correct answer: less dense than the outside air and rises

Warm air is lighter, so it rises and leaves through high openings, drawing cooler air in low down. The driving pressure is the density difference multiplied by the height between the openings, which is why the effect is small in a single storey and substantial in an atrium.

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