Why do you always put down a lamp when you go down to the cellar?

Why did you put down a lamp when you went down to the cellar? Objective In order to determine the concentration of carbon dioxide and avoid suffocation caused by high concentration of carbon dioxide, the experiment of lighting is to test whether the oxygen content in a certain space is suitable for human activities.

In order to do the lighting experiment safely, if the candle goes out or burns badly, it means that the oxygen content is low and other gases such as carbon dioxide may be high, and carbon dioxide is not provided for breathing. In this case, it will be very dangerous for people to go down. It's still oxygen content. The plants in the vegetable cellar may have light, which can absorb oxygen and release carbon dioxide. The former is combustion-supporting, and only when the content reaches a certain level can it burn well. Of course, the latter does not support combustion, but there are many gases in the atmosphere that do not support combustion. In normal air, only oxygen supports combustion, so it is mainly said that the oxygen content is sufficient. However, the air composition is generally stable, there are vegetables in the vegetable cellar, and generally only the changes of oxygen and carbon dioxide content. The light experiment tested the content of carbon dioxide from one side.

Because the cellar may be closed for a long time, due to various microorganisms or other reasons, various harmful gases may accumulate in it, or the oxygen content is very low. First of all, you can simply verify whether there is enough oxygen in the candle to support the activity, and you can also verify whether some gases such as carbon dioxide are excessive.

There will be carbon dioxide in the cellar, and the concentration may be very high! Therefore, the purpose of lighting experiment before entering the cellar is to check the content of carbon dioxide in the cellar. If you are very tall, you can't go in, because suffocation will happen, and lack of oxygen will lead to death, and it is not burning toxic gases. Because the cellar is not ventilated for a long time, people will suffocate if they go directly in. If the fire goes out in the lighting test, it means that there is little CO2 and oxygen in it.