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In this topic oxygen supports burning which we taken from science NCERT 7th standard textbook ,it will help you to understand the topic better , please do watch it . And in this topic we have some questions let us see ,

[1] How can you prove oxygen supports burning?
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Activity: Take a candle and fix it on a table. The candle is lighted. The candle will continue to burn due to continuously available fresh air providing the required oxygen for combustion.

[2 ] How can we feel the presence of air?
Since air is invisible we easily forget that it is all around us. When we blow air in a balloon, we can feel the air pushing on the balloon. It's the same with a tire or basketball. When we sit in front of a fan, we can actually feel the air molecules moving in the same direction.

[3] What does air help in burning?
Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapour and a few other gases. Some dust particles may also be present in it. Oxygen supports burning and is necessary for living organisms.

[4] how is air needed for burning?
Air contains about 21 percent oxygen, and most fires require at least 16 percent oxygen content to burn. Oxygen supports the chemical processes that occur during fire. When fuel burns, it reacts with oxygen from the surrounding air, releasing heat and generating combustion products (gases, smoke, embers, etc.)

[5]How does the sun burn without oxygen?
The sun does not run out of oxygen for the simple fact that it does not use oxygen to burn. The burning of the sun is not chemical combustion. It is nuclear fusion.

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