Why fire always up?
In the natural world and our daily lives, anyone can observe the burning flame is always upward, such as a burning candle, a bonfire outside the burning fire, etc. In ancient times, when people did not understand the scientific principles of this phenomenon, they often associated it with demons and superstitions.
The upward fire is a result of the movement of the air. When the candle was lit, the air surrounding the flame was heated. Because the hot air density is smaller than that of cold air, the hot air rises, and the surrounding cold air immediately replenishes. Following the rising momentum of the air, the flame was immediately pulled upwards by the air. When burning a bonfire outdoors, a large amount of hot air rises, cold air around quickly rushing to replenish, thereby creating a fiery bonfire scene.
Sometimes, the burning fire suddenly tilted to the left, suddenly to the right is unstable. It was a joke of the air, nothing to do with the devil. In the normal case, when the flame “calm wind calm waves,” the flame is very stable, the corresponding temperature rises a bit, the fire also rises relatively high. However, the airflow outside the house is influenced by many factors; always a little movement occurs. These movements will disturb the hot air’s normal order, thereby making the fire in the air become “unknown to anyone,” revealing the phenomenon of constant wobbling.