Weird Science: Fun with a funnel - Hawaii News Now - KGMB and KHNL

Weird Science: Fun with a funnel

(HawaiiNewsNow) - In this week's edition of Weird Science, Doctor V shows us how to put out a fire with a funnel.

Things you need:

  • Candle
  • Plate or stand for candle
  • Funnel
  • Lighter or match

 The experiment

Please do this and all experiments under the supervision of an adult. Place the candle on a stand or plate, making sure that it won't tip over. Then ask an adult to help you light the candle. With the small end of the funnel in your mouth and the large end pointing at the candle, see if you can blow the candle out. What happens to the flame? Now try pointing the small end of the funnel at the candle and blow into the large end. Can you put the candle out?

 How does it work?

When you blew through the small end of the funnel, the flame bent toward the large opening of the funnel. When you blew through the small end of the funnel, the air traveling from the narrow part to the larger part was forced to spread out which slowed down the speed of the air, making it difficult to blow the candle out. You could blow out the candle easily when you pointed the small end of the funnel toward the flame. As you blow into the large end of the funnel, your breath was forced into the smaller end of the funnel, which increased the speed of the air, allowing you to easily blow the candle out.

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