干冰是什么东西 | 干冰是什么形成的

　　CO2 freezes into a solid at -78 degrees Celsius (much lower than the temperature at which water freezes) and when it reaches room temperature it turns directly from a solid into a gas rather than a liquid. Not only is this useful for creating an atmospheric fog; it is also great for keeping things refrigerated on long journeys. By packing food in dry ice, it can be kept cool in transit without there being a messy puddle of water when it reaches its final destination. Creating dry ice is a little more difficult than just freezing water.

　　

　　在惊悚和大预算的舞台制造中，干冰是一种与冰块彻底一致的物质，它们使你的饮料抛却冷。干冰真实是2氧化碳或2氧化碳的固体模式，而不是水，而是咱们呼出的气体和动物用来光合传染感动的固体模式。2氧化碳在零下78摄氏度（比水结冰时的温度低得多），当它到达室温时，它直接从固体变成气体而不是液体。博客这不仅对发作大气雾很有用，而且对于在远程抚玩的时候抛却冷藏也很有用。在干冰中包装食品，大要在运输过程中抛却凉快，在达到终纵目的地时不会有一滩水坑。制造干冰比仅仅冻结水要困难一点。

　　

　　First you have to cool and pressurise CO2 gas to turn it into a liquid, then depressurise it so it expands back into a gas. This causes a rapid temperature drop that freezes the gas into solid dry ice.

　　

　　起首你必须冷却和加压2氧化碳气体使之变成液体，此后高涨它的压力使它紧缩成气体。这导致了一个疾速的温度下降，将气体冻结成固体干冰。

　　

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