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Private Pilot Licence (PPL) – Canada · Question

How does 'dew point' relate to fog formation?

Fog forms when the air near the ground cools to its dew point, causing the invisible water vapour to condense into visible water droplets. A small spread betwee

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Question: How does 'dew point' relate to fog formation?

Answer options:

  • Fog forms when the air temperature is significantly above the dew point.
  • Fog forms when the air temperature and dew point are far apart. ✅ Fog forms when the air temperature cools to or below the dew point.
  • Dew point has no relation to fog formation.

Correct answer: Fog forms when the air temperature cools to or below the dew point.

Explanation: Fog forms when the air near the ground cools to its dew point, causing the invisible water vapour to condense into visible water droplets. A small spread between temperature and dew point indicates high humidity and potential for fog.

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