why flame is always pointed in upwards direction?
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To start with, a flame is a hot glowing body of ignited gas. However a flame always point upwards because the flame's gas is hotter than the surrounding air and a hot gas is always lighter or less dense than a cold gas. ... Hence a flame will always point upwards.
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A candle flame keeps pointing up because it heats the surrounding air, creating streaming currents around itself. Warmer air is thinner and lighter than cooler air, since gas molecules spread out when they gain energy. As the heated air near a flame expands, it also rises, since it's lighter than the air around it.
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