argon

1. A conventional volcanic rock contains no argon right after it solidifies .

常见的火山岩在凝固的时候不含有氩元素。

2. Argon likes to escape out of rocks when they are very hot , in particular when they are melted into volcanic lava , but is otherwise trapped .

当岩石非常热，特别是熔化成火山熔岩的时候，氩很容易从岩石中逸散出来，但会被其他物质捕获。

3. The physics underlying this procedure is that potassium , which is plentiful in nearly all rocks , is slightly radioactive and decays to argon , a chemically inert element .

这种物理学测定方法的依据是：在几乎所有岩石中都可以找到钾的踪迹，而钾带有微弱的放射性，可以衰变成化学惰性元素氩。

4. Lead oxide in seal frit used for making window assemblies for argon and krypton laser tubes .

用于氩和氪激光管窗体组件制造的密封釉料所使用的氧化铅。

5. Since argon is nonflammable , special firefighting equipment and instructions are not needed .

由于氩不可燃,不需要特殊的救火设备和指导.

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