NAUI Open Water E-learning Practice Test

The ___ clear of your snorkel requires the least amount of energy.

Purge Cough Displacement Nose pinch

Correct Answer:

Displacement

Explanation:

Displacement clearing uses a gentle, efficient exhalation to push water out of the snorkel by moving the head and jaw just enough to create a flow, without needing a big blast of air. You stay relaxed, keep the mouth around the mouthpiece, and let the breath you already have in your lungs do the work of displacing the water. This takes less energy than forcing air through a purge valve or coughing to blast water out, and it’s not about pinching the nose—nose pinching is more about clearing a mask. So, by relying on a small, controlled displacement of water with minimal muscular effort, this method requires the least energy.

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