Birthday Candles Under a Glass!
What happens to the water on a plate when a candle is lit on the plate and covered with a glass?
We think water will rise inside the base of the glass, because of a result of change in air pressure between the inside and the outside of the glass.
1) Stick the birthday candle upright onto the plate with the help of play dough.
2) Pour water around the birthday candle, being careful not to touch the birthday candle.
3) Ask an adult to light the birthday candle for you.
4) Quickly cover the birthday candle with the glass.
5) Watch the water get sucked into the cup as the fire gets extinguished.
6) You do not need to do this, but if you would like to, you can repeat steps 1-5 with different temperatures of water .
Special Needs: You should be near a sink to dump out the water when you are done with the experiment.
The Science behind it
When the glass covers the lit candle, the temperature in the glass goes up. The difference in air temperature created between the inside and the outside of the glass causes an increase in air pressure in the glass. A vacuum effect is created. When the candle is lit, the temperature and pressure in the glass start to drop, which pulls water into the glass.
Our hypothesis was proved to be correct because when a candle was lit and covered with a glass on a plate full of water, the water did get sucked into the glass. The candle started to go out as the temperature and pressure inside the glass dropped.
I am 10 years old and my teacher is Ms.Vita. I have an older brother in seventh grade. My favorite color is blue. My favorite food is sushi.
I am 10 years old and my
teacher is Ms. Vita. I have an
older sister in eighth grade.
My favorite colors are light blue and light purple. My favorite food is pizza.