
J2_第4章 空气的成分 02
Presentation
•
Science
•
7th Grade
•
Easy
W.Y. Tan
Used 3+ times
FREE Resource
14 Slides • 2 Questions
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by W.Y. Tan
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Open Ended
早期的稀有气体,被称为“惰性气体”?你觉得原因会是为什么?
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惰性气体(现在不用这个名称了)
早先人们认为它们不与任何物质发生反应
但是,在特定条件下是能够与其他物质其反应
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•由镭、钍等放射性元素的原子核发生变化是产生的
•具有放射性
•形成氡后,很快衰变称为稳定的元素铅。
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Open Ended
在不知道自己的住家是否有氡气累积的情况下,我们可以如何让自己免于受氡气的侵害?请发表你的想法
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•很轻
•不会引起爆炸
•用途
• 充气球或飞艇
• 高空观察
• 运输资料
• 收集气象资料
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•氦气+氧气
•混合冲入氧气筒
•供深海潜水员呼吸
原因:氦气在高压下难溶于水
潜水病(Decompression Sickness)
如果用普通氧气筒
潜水员入深海时,氮气会溶解入血液里
当潜水员浮出水面后,原本溶解的氮气会溢出,形成气泡,造成血管阻塞,
潜水员丧命。
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液态氦
制造低温环境
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• 充入灯泡,保护灯丝
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充填电弧灯 – 表示飞机跑道
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•装入特别玻璃罐中,再用高压放电,能发出强光
•Sport light,闪光灯
•液态氙 – 冷冻麻醉
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by W.Y. Tan
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