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Bulle d'air

Popular expression for the measuring and display sensors of conventional spirit levels.

Bubble levels usually consist of a curved, transparent tube which contains a liquid substance with an enclosed bubble of air. Depending on the inclination of the bubble level, the air bubble changes its position inside the tube indicating the angle of deviation from the vertical or horizontal plain. Bubble levels with a pronounced curvature are less precise, whereas those with a slight bend are more accurate. However, with increasing precision they become harder to read.