Sir James Dewar, in the year 1892. It consists of a double-walled flask with a vacuum between the walls. The walls are silvered and heat cannot be conducted across a vacuum. They keep hot liquids hot because the heat cannot get out and cold liquids cold because heat cannot get in. After the liquid has been poured in, a cork stopper is used to seal the flask as cork is a very poor conductor of heat.
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बोलो राम जय जय राम, जन्म सफल होगा बन्दे, मन में राम बसा ले, हे …