What happens when you put snow in a vacuum chamber? In this video from Cody’s Lab, we find out. At first, the results don’t seem very exciting. But if you know what to look for, there’s a fascinating phenomenon to observe here. Namely, the fact that when snow melts at such a low pressure point, it can’t turn into liquid. Instead, it turns directly from ice into vapor, a process known as sublimation. This is the same reason why dry ice smokes when exposed to air–it’s frozen carbon dioxide, which sublimates in Earth’s atmospheric conditions. View full post on YoutubeIt’s a lot harder to melt ice in a vacuum for other reasons, too. It’s very cold in a vacuum chamber, as Cody proves with a temperature gauge. The snow inside gets down to near negative 15 degrees Fahrenheit. It’s a cool reminder of how dependent everything on Earth is on the exact atmospheric conditions that makes life here possible. Source: Cody’sLab
