cid 9774436223c6712e6a4b3a3eeb9499ba96fcc4db836605bfb9e51ad5f086c01f · original · open access · via wikipedia
Title: Vacuum flask Authors: Venue: Wikipedia Year: unknown Canonical: wiki:vacuum-flask URL: https://en.wikipedia.org/wiki/Vacuum_flask Collector: wikipedia OA: true ABSTRACT A vacuum flask is an insulating storage vessel that slows the rate at which its contents change in temperature. It greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings by trying to be as adiabatic as possible. Invented by 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. When used to hold cold liquids, this also virtually eliminates condensation on the outside of the flask.