How to prove that oxygen is needed for burning? Why not nitrogen gas? Or any other gas ? Give me the best experiment. Explain it so that a class5 student can understand it.
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I have done this demonstration in class to talk about gas laws, but not to talk about the composition of the gas.
What is happening is the candle inside the glass is obviously hot and the flame with heat up the surrounding air. As temperature of a gas increases, the volume of the gas increases. This is why you might see some bubbles coming out of the bottom of the glass if you don't have a good seal. The candle will continue to burn until the oxygen is consumed from the air. Then when the candle goes out the temperature of the air will decrease. As the temperature decreases the gas will contract, which causes a vacuum inside of the glass (or an area of low pressure). Water will move from high pressure to low pressure because the pressure of the air is higher on the water outside of the glass than the pressure on the water inside of the glass
What is happening is the candle inside the glass is obviously hot and the flame with heat up the surrounding air. As temperature of a gas increases, the volume of the gas increases. This is why you might see some bubbles coming out of the bottom of the glass if you don't have a good seal. The candle will continue to burn until the oxygen is consumed from the air. Then when the candle goes out the temperature of the air will decrease. As the temperature decreases the gas will contract, which causes a vacuum inside of the glass (or an area of low pressure). Water will move from high pressure to low pressure because the pressure of the air is higher on the water outside of the glass than the pressure on the water inside of the glass
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for that firstly take one candle and burn it using matchstick than u will observe that the candle doesn't flew but after that take one glass and cover the candle with it and u will observe that will flew after a second...so i think it is easiest example to explain a kid of class 5....
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