Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly, for example by dipping it in water, it will be very hard but also very brittle that is, it will break easily. Metal that has been annealed is soft but does not break as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes．Annealing can also be used on other material, such as glass.
退火是一种使金属变软的方法，先加热金属，然后让其缓慢冷却。如果金属加热后快速冷却，例如将其浸入水中，会变得非常硬，但也很脆，容易断裂。退火后的金属很软，但不易断裂。通过对金属进行退火，可以使其达到所希望的硬度。金属加热后允许在一定时间内缓慢冷却。加热的金属缓慢冷却的时间越长，它就越软。退火也可用于其他材料，如玻璃。
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