Answer
THE FLAME FRONT
火焰前緣
WINDOW QUESTION · ANSWERSTEAM SQUAD
The question
WHAT IS THE MOVING BOUNDARY BETWEEN BURNING GAS AND UNBURNED VAPOUR CALLED?
燃燒區域和未燃燒蒸氣之間快速移動的邊界叫什麼？
Why it works
AT 240 FPS, THIS RAPIDLY MOVING COMBUSTION BOUNDARY BECOMES VISIBLE
240 fps 慢動作讓這個快速傳播的燃燒邊界變得清楚可見
See it in action · THE WHOOSH BOTTLE IN SLOW MOTION
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