school use physical gas flow rate apparatus for senior middle school

It is composed of air pump, primary flow tube, secondary flow tube, tertiary flow tube, O-ring, connector and bracket.

The flow tube is divided into three stages. The diameter of the third stage flow tube decreases in turn, and the diameter of the first stage flow tube is the largest. When the gas is injected into the flow tube with the air pump, it will be observed that the pressure connected to the first stage flow tube is the largest (by reading the relative pressure sensor value), the pressure of the third stage flow tube is the smallest, and the pressure of the second stage flow tube is between. That is to say, the faster the gas flow rate is, the smaller the pressure is . The relative positions of three velocity tubes can be changed to explore the influencing factors of pressure.

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