太空之火
(原标题: Fire in Space)
2021-08-10
浏览次数: 32
火在太空中是什么样子的？在地球的重力作用下，加热的空气上升膨胀，导致火焰呈泪珠状。然而，在充满空气的国际空间站（ISS）的微重力环境中，火焰是球形的。火是快速获取氧气的过程，当太空火焰从各个方向随机漂浮时，会遇到新的氧分子——形成包围的球体。在国际空间站燃烧集成架拍摄的特色图像中，球形火焰包裹着炙热的发光烟灰簇。如果没有氧气，比如在真空的空间里，火会立即熄灭。与火有关的许多化学反应都很复杂，在微重力下进行测试不仅可以帮助人类更好地了解火，还可以帮助人类更好地了解如何灭火。
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What does fire look like in space? In the gravity on Earth, heated air rises and expands, causing flames to be teardrop shaped. In the microgravity of the air-filled International Space Station (ISS), however, flames are spheres. Fire is the rapid acquisition of oxygen, and space flames meet new oxygen molecules when they float by randomly from all directions -- creating the enveloping sphere. In the featured image taken in the ISS's Combustion Integration Rack, a spherical flame envelopes clusters of hot glowing soot. Without oxygen, say in the vacuum of empty space, a fire would go out immediately. The many chemical reactions involved with fire are complex, and testing them in microgravity is helping humanity not only to better understand fire -- but how to put out fire, too.