The fluctuation of the water level in the small arm of the water seal with respirations is called:

Tidaling

Explanation:

It is rise and fall of water in water-seal chamber, used to determine the degree of re expansion of the lungs. It reduction shows the lungs reexpands.

However, with respiratory efforts it is normal.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

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