Why fire burns upward?

Alta Wildfires 20160507

  • 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 arround of upper flame get very hot and its density will decrease atoms arround 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 Buyonacy Force.
  • The color of the flame is spooky blue light.
  • So, fire burns upward due to buoyancy force.