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Re: Please Explain

Long ago years of research were done in order to find metal alloys that would have the same rate of expansion as the glass used in tubes. The glass to metal seal is fundamental to maintaining vacuum. If this wasn't the case, as you suggest, tubes would lose their vacuum pretty quickly simply through thermal cycling in normal use.
"As far as my knowledge goes, the thermal expansion coefficient of the metal pins in a tube is significantly different than it is for the glass bulb. My mind
would suggest that the seal of the glass around the pins is at risk in a cryogenic freezing. Wouldn't the pins contract at a faster rate than the glass?"



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  • Re: Please Explain - Harry 04/30/0117:36:06 04/30/01 (0)


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