Why in zero gravity a candle's flame is round and blue?
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When you burn a candle, the air near the wick gets hotter and ( being less dense) gets pushed up by heavier and denser cold air(being heaver cold air is pulled down to earth). Flame of a candle is actually burning wax vapors. When the hot air rises, wax vapors also rises(because they are also hot!). This gives the flame its familiar rising shape.
Hot air (including unburnt wax vapors and products of combustion) rising up from candle is replaced by relatively cooler, oxygen rich and denser air. The cool air remains fresh as long as it is below the wick. There the clean oxygen is used up in 'complete' combustion of wax vapors and therefore the bottom part is bluish in color.
hope it help :-()
here is your ans
When you burn a candle, the air near the wick gets hotter and ( being less dense) gets pushed up by heavier and denser cold air(being heaver cold air is pulled down to earth). Flame of a candle is actually burning wax vapors. When the hot air rises, wax vapors also rises(because they are also hot!). This gives the flame its familiar rising shape.
Hot air (including unburnt wax vapors and products of combustion) rising up from candle is replaced by relatively cooler, oxygen rich and denser air. The cool air remains fresh as long as it is below the wick. There the clean oxygen is used up in 'complete' combustion of wax vapors and therefore the bottom part is bluish in color.
hope it help :-()
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