How it got here: Scottish chemist and physicist Sir James Dewar invented the vacuum flask Iin 1892 as a way to keep liquid nitrogen from warming up and turning into gas in his lab.
它是如何问世的：1982年苏格兰化学家和物理学家JamesDewar爵士发明了保温瓶用以防止实验室中的液氮升温而气化。
A conventional thermos isn't good enough, but a Dewar flask, invented in the 19th century, holds cryogenic fluids like liquid nitrogen at temperatures of -196oc (-321of) for months at a time.
传统的恒温器不够好，但是19世纪发明的Dewar flask一次能保持像液态氮这样的温度在- 1960华氏摄氏度的低温液体好几个月之久。
A suitable device was used instead of the original Dewar flask in the phosphorescence attachment of the spectrophotometer.
在磷光附件中使用了适当的装置以代替原有的杜瓦氏瓶。
An analysis of the mechanism of heat transfer in Dewar flask is made and shows that heat radiation in given case is not negligible.
本文对杜瓦瓶的传热机制进行了定量分析，指出热辐射传热在杜瓦瓶情形下是不可忽略的。
An analysis of the mechanism of heat transfer in Dewar flask is made and shows that heat radiation in given case is not negligible.
本文对杜瓦瓶的传热机制进行了定量分析，指出热辐射传热在杜瓦瓶情形下是不可忽略的。
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