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The so-called connector is two or several containers connected with each other below the liquid level. The liquid level height of a connector containing the same liquid and equal pressure on the liquid level is equal.

(1) If the connector contains the same liquid, but the pressure on the liquid level is different, the pressure difference of the liquid level is equal to the pressure difference caused by the liquid level difference between the two containers of the connector.

(2) The pressure on the liquid surface of the connector is equal, but there are different liquids on both sides that are not mixed with each other. The height of the two liquid surfaces from the dividing interface is inversely proportional to the liquid density. The principle of connector is widely used in engineering. Such as various liquid level gauges (water level gauge, oil level gauge, etc.), mercury vacuum gauge, liquid column wind pressure gauge, differential pressure gauge, etc., are all made by using the principle of connecter. Understanding the definition and working principle of the connector will help us better understand and develop the connector market.