Boating Coach
Before you goQuestion 270 of 566

Propane and butane vapours are heavier than air. Where do they flow in your boat?

  1. Up to the cabin roof.
  2. Into the lower parts of the boat.
  3. Out through the windows at once.
  4. Evenly through the open deck.
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Correct answer: Into the lower parts of the boat.

Heavy vapours sink to low places, are hard to remove and can explode.

Source: Safe Boating Guide (TP 511E, 2026), Reduce the risk of explosion, page 35

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Questions last reviewed: 18 October 2026