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The direction of flame always goes up

Hi Steemian how are you? Hopefully healthy and creative work.
One of the changing factors of human civilization is fire. Before humans knew about the use of fire, they didn't cook food well. Humans are also still not familiar with the manufacture of various equipment that uses fire. At night it will always be in the dark. then the activities are automatically carried out more during the day.
With fire, humans began to recognize the culture of cooking food. In the next stage, humans are familiar with making metal weapons with the help of fire.
Fire is an important factor in life. in prehistoric societies like us studying at school, one of the tasks of women is to keep the fire from dying out, while men hunt in the forest.
In an increasingly modern civilization fire is still needed. When the lights go out, we can light a candle. When cooking, we have to light the stove. Likewise, when camping, we need to light a fire as a warmer and light for all camp participants.

The direction of the flame is always up

Fire will always be needed in human life. We need to light a fire for various purposes. but have we ever noticed the direction of the flame? We can do a small experiment.
Try lighting a candle. Then change its position in various directions. Tilt the candle then lift the candle so that the hotspot is below. Then pay attention to the direction of the flame. The flame will stay up, no matter where the axis is.
We can also see the direction of the flame on the stove or campfire. All directions of fire always go up.
Keep in mind the flame can occur due to the oxidation process which is assisted by sparks. A combustion will not occur without the role of oxygen or other flammable gases.
Fire is the energy produced by destroying mass. For example, if it will be formed by burning firewood, coal or LPG gas. Energy in the form of heat (heat) and light.
The heat energy produced by the combustion of mass of objects makes the gas in a place of fire become hot. In the hot gas will make the gas molecules move faster and farther apart from each other. because the gas molecules away causes the expansion of the gas. When the gas turns up the volume grows. The greater the volume of material and the mass will still result in smaller density. The smaller the mass of the genus will cause it to move upward and the gas vacuum is filled with cold gas and has a greater density. This incident happened continuously so that the fire will always point upwards.
Thus my writing about the direction of fire which always upwards may increase our knowledge.

Thank you for reading my post. I hope you enjoy it.