Why is the drainage method short in and long out ???

Because the density of the gas entering the short pipe is smaller than that of water, the gas floats on the water when it enters the gas collection cylinder, and the water is pressed out of the long pipe due to the increase in the pressure of the gas entering the cylinder.

If gas water is introduced from the long pipe, it cannot flow out of the short pipe due to gravity, so it should be short in and long out.

Pressure is easy to understand, you put gas into a bottle full of water, and the gas will not enter the bottle, because there is pressure in the atmosphere, and if you put a small hole in the bottom of the bottle and then pass in the gaseous water, it will flow out. ）

The "short in and long out" drainage method generally collects gases that are insoluble in water: oxygen, hydrogen, etc., and the use of short in and long out is to let the collected gas enter the gas collection cylinder from the short mouth, and due to the increase in the pressure in the cylinder, the water will be extruded from the long mouth, so as to gradually collect the gas. This also prevents the gas from escaping the cylinder.

Because the density of water is greater than that of gas, under the bottle, the gas enters the top of the bottle and will fill the bottle, to drain the water, the drain pipe must be long, and the gas is short to prevent sucking!

Because the gas has to expel the water from the cylinder, it has to be pressed out by pressure, and the "grown" is to drain the water (if it is short, the water will not be pressed).

"Short in and long out" is a drainage method used when the tank is not used, the gas enters from the short pipe, and the density relationship gathers on it, and when the gas gradually increases and the volume of water is occupied, the water will be discharged from the bottom from the long pipe, so as to achieve the purpose of collecting gas.

The density of water is greater than that of air, and of course it is also long in and short out.

You can recall the air pressure problem in the second year of junior high school, because the air pressure in the bottle is greater than the outside of the bottle, so the pressure on the water outside is relatively small, and the pressure of the gas inside overcomes the gravitational pressure of the water to expel the water out of the bottle.

The drainage method is generally used to measure the volume of gas, of course, the premise is that it is a gas that is insoluble in water, and the liquid is compressed when the gas comes out of the short glass tube to make the liquid discharge, so it should be short in and long out.

The drainage method is generally used to collect gas, the principle is to use the gas to generate pressure to discharge the water, if it grows in, it will not achieve that effect, the gas enters the water and bubbles, and the water is not discharged cleanly, and the collected gas will run away, only when it grows.

If it is short, it is conducive to the removal of air in the reaction test tube, so as not to cause phenomena such as **. It grows out for ease of collection.

The short feed allows the gas to collect in the upper half of the bottle and press the liquid out of the long tube. If the gas enters through the long pipe, it will be discharged directly from the short pipe.

Only when it is short in and long out can the water be pressed out.

The gas does not dissolve in water, and when it goes to the surface of the water, it occupies the space of the water, and it drains the water out of the lower end of the long tube.

If nothing else, I'll ask you two questions, and as long as you understand these two questions, you will understand the questions you are asking.

1. Which is less dense, gas or water?

2. The water has been underneath, if it is long in and short out, will there be water discharged from the conduit?

The density of the gas is much smaller than that of the liquid, and it will float on the liquid and collect and drive the water out from the lower end of the long section.

Drainage water is generally underneath and can only go out from below.

Summary. Hello dear. The density of the gas entering the short tube is smaller than that of water, and the gas floats on the water when it enters the gas collection cylinder, and the pressure in the cylinder increases due to the introduction of the gas, and the water is pressed out of the long pipe.

If gas water is introduced from the long pipe, it cannot flow out of the short pipe due to gravity, so it should be short in and long out.

Hello dear. The density of the gas entering the short tube beam is smaller than that of water, and the gas floats on the water when it enters the gas collection cylinder, and the pressure in the cylinder increases due to the introduction of the gas, and the water is pressed out of the long pipe. If the slag search enters the gas from the long pipe, the water cannot flow out of the short pipe due to gravity, so it should be short in and long out.

The "short in and long out" drainage method collects insoluble gases: oxygen, hydrogen, etc., and the use of short in and long out is to let the collected gas hood from the short mouth into the gas collection cylinder for distribution, due to the increase in pressure in the bottle, the water will be squeezed out from the long mouth, so as to gradually collect the gas. This also prevents the gas from escaping the cylinder.

Pei Sulkai. The drainage method, that is, the method of draining and collecting gas and early virtual body, is a method of collecting gas and burning gas in experimental chemistry. This method is used when the gas does not react with water and is not easily soluble in water.

The advantage of the drainage method is that the resulting state gas is more pure than that of the exhaust method. If two gases are to be mixed in a certain volume, the volume of the collected gas can be roughly controlled by observing the amount of water in the gas collector cylinder.

If hydrogen and oxygen are mixed 1:4, some hydrogen can be collected first, and when there is about 3 4 water left in the bottle, take it out, and then collect oxygen until the cylinder is full.