Fire behaves very differently in microgravity — and this ISS experiment shows it beautifully. 🔵 With no “up” in 0g, hot gases don’t rise, so the flame becomes a perfect sphere. Combustion completes more cleanly, giving the flame its blue color. When you see sudden orange patches, that’s soot forming — a brief moment of incomplete burning, similar to flames on Earth. As the droplet burns, tiny asymmetries push it gently through the air until the fuel is gone and the flame silently disappears. |
0:45
Fire behaves very differently in microgravity — and this ISS experiment shows it beautifully. 🔵 With no “up” in 0g, hot gases don’t rise, so the flame becomes a perfect sphere. Combustion completes more cleanly, giving the flame its blue color. When you see sudden orange patches, that’s soot forming — a brief moment of incomplete burning, similar to flames on Earth. As the droplet burns, tiny asymmetries push it gently through the air until the fuel is gone and the flame silently disappears. |
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Explaining The Universe on Instagram: "Spherical flames in space occur because of microgravity, and they look very different from flames on Earth. On Earth, gravity causes hot gases to rise and cooler air to flow in from below. This buoyancy-driven convection stretches a flame upward into a teardrop shape. In space, however, gravity is essentially absent, so hot gases do not rise. Without convection, oxygen reaches the flame only by diffusion, evenly from all directions. • #explore #explaining #
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What happens when fire burns in space? A fascinating experiment aboard the International Space Station (ISS) reveals that in microgravity, flames behave in ways impossible on Earth. Using a 50/50 mix of iso-octane and heptane, scientists observed something striking: a nearly perfectly spherical flame. Why? On Earth, hot air rises, shaping flames into the flickering, teardrop forms we’re used to. But in zero gravity, there’s no “up”—so the flame expands symmetrically in all directions. The result
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During a live orbit to ground lecture, a Chinese astronaut lights a match and candle to show students how gravity shapes fire. In microgravity the usual teardrop flame collapses into a blue spherical glow, driven by diffusion instead of rising hot air. Follow @spaceeves #Microgravity #Combustion #SpaceLecture | SpaceEve
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Flames tend to be spherical in the absence of gravity because there is no gravitational force to create the buoyant convection that lifts hot gases and pulls cooler air in. In microgravity, the flame expands equally in all directions, forming a sphere. This differs from Earth, where gravity pulls denser, cooler air down to the flame, which rises as it heats, resulting in the typical teardrop shape. On Earth, the flame's teardrop shape is due to buoyant convection. Hot, less dense air rises, and
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