Who invented thermos flask?
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Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.
mannat02:
thnks sahana
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Thermo flask was invented byJames Dewar
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