The candle experiment would likely be impossible on the International Space Station, which has strict rules regarding flammable materials and naked flames.
Lit candles on Earth produce flames shaped through buoyancy-driven convection, with hot air rising and cold air descending. That combustion convection current is weak in the microgravity environment of low Earth orbit, however. This means flames diffuse in all directions, resulting in spherical fireballs. Astronauts Gui Haichao and Zhu Yangzhu light a candle aboard the Tiangong Space Station during a live lecture on Sept. 21, 2023.
The livestreamed lecture was the fourth so-called"Tiangong classroom" hosted on China's space station. The astronauts interacted with students in five classrooms across China, demonstrating a number of microgravity phenomena. As with, the astronauts demonstrated that many physical processes behave differently than they do on Earth.
However the candle experiment — in which Gui strikes a match to produce a naked flame to light the candle — would likely be met by surprise by International Space Station participants, who have strict rules regarding flammable materials and naked flames. I made this - that time ESA astronaut @Astro_Alex made Mission Control think he might have snuck an actual candle onto @Space_Station. It's amazing what you can do with an old penlight and some spare metallic tape: https://t.co/5UvfA1kC8j pic.twitter.com/TFlHX42YOp
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