you need
  • Two tubes
  • venting tube
  • Air bath
Vladimir Ryumin, the author of the book "Entertaining chemistry"advises proceed as follows.The end of the vapor tube through which hydrogen will come, immersed in an air bath.Air bath in this case can be considered either a vessel filled with water.For example, a deep bowl or plate.Take the first test tube.Fill it with water up to the top, close the wide opening with your finger and place the tube over the vapor tube so that the end of the tube was immersed in a water bath air.Remove your finger.Now the gas that goes from the vapor tube, will be assembled at the end of a sealed tube and gradually displace the water from it.This is called "fill tube from under water".This process is necessary because there is a danger of formation of explosi
ve mixture of hydrogen and oxygen.This mixture is therefore called "rattlesnake", which is ignited by the smallest spark as a result of exploding with a blinding flash, forming water vapor.After burning in the air, hydrogen is oxidized and converted to water, thus justifying and confirming its name.
take a second empty tube.Put it opening up next to the first.In this case, the tube is only considered to be "empty", in fact, it is filled with air.In her and will "pour" hydrogen.
Since hydrogen is fourteen times lighter than air, it will have to pour "on the contrary", that is, to keep the tube perevernutymi.Dlya this tube filled with hydrogen needed as quickly as possible to turn up the hole so that it had to likejust below the opening of the second tube.Easy gas rises or "pour" up and pushed out of the top of the tube heavier air.Perhaps, in order to learn the skills it takes not one, but several exercises.We are accustomed to liquids heavier than air that poured from the top down, well, a substance is lighter than air it's different.