Answer
CARBON DIOXIDE, OR CO₂
二氧化碳（CO₂）
WINDOW QUESTION · ANSWERSTEAM SQUAD
The question
WHICH GAS CARRIES THE COLOURED WATER DROPLETS UP THROUGH THE OIL?
熔岩燈中，哪一種氣體會帶著彩色水滴穿過油層上升？
Why it works
BUBBLES LIFT THE WATER, THEN THE DROPS SINK AFTER THE GAS ESCAPES
氣泡帶著水滴上升；氣體逸出後，水滴又沉下去
See it in action · THE HOMEMADE LAVA LAMP
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