新概念英语第一册63课课文.pdf

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新概念英语第一册63课课文

Lesson63Aglassenvelope

Inthepreviouslessons,wehavelearnedaboutthehistoryoftheenvelope.Today,wewill

introduceanewtypeofenvelopecalledtheglassenvelope.Aglassenvelopeiscommonlyused

inthefieldofelectronicsandisanessentialcomponentofvariousdevicessuchasvacuum

tubesandlightbulbs.

Aglassenvelopeisasealedglasscontainerthatprotectsdelicateelectroniccomponentsand

ensurestheirproperfunctioning.Itismadefromhigh-qualityborosilicateorsoda-lime

glass,whichisknownforitsexcellentthermalresistanceandelectricalinsulation

properties.Theglassenvelopeiscarefullydesignedtowithstandhightemperaturesand

pressuredifferentials,makingitsuitableforawiderangeofapplications.

Themanufacturingprocessofaglassenvelopeinvolvesseveralintricatesteps.First,the

glassismeltedinafurnaceatextremelyhightemperatures.Themoltenglassisthenshaped

intoatubeorabulbusingvarioustechniques,includingblowingandpressing.Next,thetube

orbulbiscarefullycooledandannealedtorelieveinternalstressesandstrengthentheglass

structure.

Aftertheglassenvelopeisformed,itundergoesaseriesofrigorousteststoensureits

qualityandperformance.Theenvelopeischeckedforanydefectsorimpuritiesthatmayaffect

itsfunctionality.Moreover,itissubjectedtohigh-voltageteststomeasureitselectrical

insulationpropertiesandensureitcanwithstandtherequiredvoltage.

Oncetheglassenvelopepassesallthetests,itisreadytobeusedinelectronicdevices.

Vacuumtubes,forexample,relyonglassenvelopestomaintainavacuuminside,whichis

crucialfortheiroperation.Lightbulbsalsoutilizeglassenvelopestoprotectthefilament

andprovideacontrolledenvironmentfortheemissionoflight.

Inconclusion,theglassenvelopeisanimportantcomponentinthefieldof

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