Why can't the measuring cylinder pressure be adjusted because the catheter is too short?

Answer: The principle of measuring cylinder is:

1. First inject water (or other liquid) into the tube, move the glass tube on the right up and down to make the liquid level on both sides level (keep the pressure in the left tube equal to atmospheric pressure), and read the liquid level in the left tube for reaction. After the reaction, move the glass tube on the right up and down to make the liquid level on both sides level (ensure that the pressure in the tube is consistent with atmospheric pressure during the second reading, which is the same as the standard for the first reading).

2. The short inlet and outlet air duct is a device used to press the liquid in the gas container into the measuring cylinder to measure the gas volume. After the gas introduced into the left airway is introduced, the pressure in the gas container increases, which is greater than the atmospheric pressure outside, and the liquid will flow into the measuring cylinder along the long conduit. In this way, the volume of gas can be obtained by measuring the volume of discharged liquid.

Relatively speaking, this equipment is relatively simple. It is based on the principle of collecting gas by drainage method. Firstly, the measuring cylinder is filled with water, inverted in the water tank, and then the gas to be measured is introduced into it. After the internal water is discharged, the volume of the gas to be measured can be read.