Air comprises of 20.9% of oxygen . But this is the fact that we read in the books . As commoners , we really can't measure the level of oxygen in air . But atleast by performing a simple and easy experiment in our house itself , we can observe the presence of oxygen in air . Sounds exciting ????
Here we go . All we need is a bowl of water , a candle and a vertical glass jar ( so that we can observe the emptiness of jar getting replaced by water ) .
Now we are lighting the candle which is already placed firmly in the bowl of water . Now we cover the candle by the vertical glass jar by keeping it upside down .
The candle will burn for a few seconds . When it is burning , we can observe that water has not entered the glass jar though it is immersed in the water . Because there is no space as air has occupied the whole space .
After a few seconds , candle will die off . As soon as it goes off , water enters the vertical upside glass jar . But it will not completely fill the jar . Only a small portion from down of glass jar .
We know , candle requires oxygen to burn . But here we are covering it with the glass jar . So candle goes on burning till the oxygen present in vertical glass jar . As soon as oxygen dried out , even the candle dies off .
Here comes our observation . There is still air inside the glass jar . But candle has used only the oxygen part of air . So now the place of oxygen is vacant . As we are doing the experiment in the water bowl , water rushes inside the glass jar to occupy only the vacant place .
Remember air is made of other gases too besides oxygen . So water will not cover whole glass jar because other gases in the air are still present inside glass jar .
This illustrates the presence of oxygen in air .
If we stop breathing , we die . Because we breathe only oxygen in the air . This way also , we can observe . But it creates more unnecessary problems !!
Here we go . All we need is a bowl of water , a candle and a vertical glass jar ( so that we can observe the emptiness of jar getting replaced by water ) .
Now we are lighting the candle which is already placed firmly in the bowl of water . Now we cover the candle by the vertical glass jar by keeping it upside down .
The candle will burn for a few seconds . When it is burning , we can observe that water has not entered the glass jar though it is immersed in the water . Because there is no space as air has occupied the whole space .
After a few seconds , candle will die off . As soon as it goes off , water enters the vertical upside glass jar . But it will not completely fill the jar . Only a small portion from down of glass jar .
We know , candle requires oxygen to burn . But here we are covering it with the glass jar . So candle goes on burning till the oxygen present in vertical glass jar . As soon as oxygen dried out , even the candle dies off .
Here comes our observation . There is still air inside the glass jar . But candle has used only the oxygen part of air . So now the place of oxygen is vacant . As we are doing the experiment in the water bowl , water rushes inside the glass jar to occupy only the vacant place .
Remember air is made of other gases too besides oxygen . So water will not cover whole glass jar because other gases in the air are still present inside glass jar .
This illustrates the presence of oxygen in air .
If we stop breathing , we die . Because we breathe only oxygen in the air . This way also , we can observe . But it creates more unnecessary problems !!
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