Perfect example from @jwalkingscience of how temperature affects the expansion of gas 🧪 . As the alcohol burns, it heats the gas, causing it to rapidly expand and leave the bottle. Once it cools the remaining gas contracts reducing the internal pressure of the bottle. Atmospheric pressure surrounding the bottle has a higher pressure and causes the red water to be pushed into the bottle 🧫 . 👩🏻‍🔬Follow @sciencewithhazel . ❤️ tag your friends . 🎥 Credit @jwalkingscience | Science with Hazel