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Candle In The Wind

Candle In The Wind

air - air pressure - high pressure - low pressure - bernoulli - bernoulli principle

Students watch the counterintuitive reaction of a candle flame to fast moving air.

Introduction

Bernoulli's principle states that as the speed of air increases, the pressure decreases. When you blow against one side of the flame, you are creating an area of low pressure (the faster the air moves, the lower the pressure). The relatively high-pressure air on the other side of the candle will rush over to fill the area of low pressure ("winds will blow from high to low"), effectively pushing the flame over so that it bends towards the straw.

Objectives

Students will be able to:

  • Explain how air pressure works. 
  • Describe the Bernoulli Effect
Entire Activity

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