} ?> Why fire burns upward? - Go Physics

Why fire burns upward?

(Last Updated On: January 27, 2018)

Why fire burns upward?

Usually you see that fire burns upward but you ever thinks about why fire burn upward?

Why fire doesn’t burn downward? What is the reason behind this? Here is you can understand the reason easily.


fire burns upward

  • We all know that fire burns upward. But why?
  • We can understand this with a candle example.
  • When we burn a candle, then we saw that fire burns upward. In this process, base of flame not so hot than upper flame. So atom around of upper flame get very hot and its density will decrease atoms around of base of the flame get low heat and its density will increase. So, there is work a force due to difference in density, which apply opposite to the gravitational force. It is called Buoyancy Force.
  • The color of the flame is spooky blue light.
  • So, fire burns upward due to buoyancy force.

3 thoughts on “Why fire burns upward?

  • January 8, 2018 at 6:22 pm

    for example: When we light a candle, the surrounding molecules of air around the flame collides with each other as it becomes hotter and hotter and the density of this hot air molecules tends to go upward. This upward motion of hot air molecules influence the shape of fire because thecold air from the bottom part of the candle moves upward and that determines the shape of fire from down -up. Also this can be explained by air ventillation process. The cold air entering a room tends to go down the floor while the hot air inside the room tends to rise faster exiting the room thereby cooling the room in the process.


Leave a Reply

Your email address will not be published. Required fields are marked *