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ionisation |
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Excitation of a plasma requires partial ionisation of neutral atoms and/or molecules of a medium. Lyrid meteors are swift (entry velocity 49 km/s) and can often be bright and leave behind good persistent ionisation trains, particularly in the predawn twilight. The Japanese long ago realised that standing next to a waterfall, whereionisation also occurs, makes people feel better and German scientists in the1930s used ionisation chambers to train bomber pilots to stay awake longer andbe more alert. |
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