View source for Mercury-in-steel thermometer



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== mercury-in-steel thermometer ==
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<div class="definition"><div class="short_definition">A [[liquid-in-metal thermometer]] in which [[mercury]] is enclosed in  a steel envelope.</div><br/> <div class="paragraph">The change in internal [[pressure]] caused by the [[temperature]] variation is measured by a [[Bourdon tube|Bourdon  tube]] that is connected to the mercury by a capillary tube. This instrument is very accurate and  has extremely good pen control when arranged as a [[thermograph]].</div><br/> </div>
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