What is the operating principle upon which a bubble tube system operates in indicating liquid tank level?

Question

Accepted Answer

The air pressure required to force air bubbles into the liquid near the bottom of the tank is proportional to the liquid level in the tank.

Answer

The air pressure required to force air bubbles into the liquid near the top of the tank is proportional to the liquid level in the tank.

Answer

The air pressure required to force air bubbles into the liquid near the bottom of the tank is inversely related to the liquid level in the tank.

Answer

The air pressure required to force air bubbles into the liquid near the top of the tank is inversely related to the liquid level in the tank.

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