Ko te pounamu Dewar a Cryar, i hangaia e Sir James Dewar i te 1892, he ipu pupuri penapena. Kei te whakamahia whānuitia i roto i te kawe me te penapena i te waipiro wai (hauota waipiro, waikawa wai, towai wai, me etahi atu) me te puna makariri o etahi atu taputapu whakangao. Ko te cryogenic Dewar c ...
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