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You have to relight the Bunsen Burner every time you use it.
check the gas line for holes
It is dangerous as other people may just place their hand or other objects over the Bunsen burner causing injuries or burns, especially if it is a non-luminous flame which makes it difficult to tell that the burner is actually lit. You should always switch off the Bunsen burner before leaving to prevent injuries to others and yourself.
when you light up the burner you should see that the Bunsen burners air hole is closed that is the safest flame
i am not sure can someone else answer this please
This is not a very well worded question. What do you mean by why should it be used? I Bunsen burner is used for heating things, usually in a lab setting.
Safety flame
no
The blue flame of the Bunsen burner is when it is hottest. The yellow flame is the safety flame. you should always start the burner on the safety flame which is produced when the holes on its base are closed.
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Watch out for the fire as it might burn the equipment
If you light the burner from the top, the lighting instrument will be blowin out by the force of the gas.