Why do you have the air hole closed when you light the burner? Why is it important to start on the safety flame, what will happen if you didn't? PLEASE SPECIFY WHY ITS NEEDED
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An man covers one.third of his journey at 9kmhr and the remaining at 5kmhr his average speed is
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A lighted Bunsen Burner with its air holes closed giving a yellow safety flame. You must never use the yellow safety flame to heat something. Before you can heat something you must open the air-holes by turning the metal collar. The more the air holes are open, the more fierce the Bunsen flame.
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