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A flask is used to mantain temperature of something inside it. It prevents the loss of heat through convection, conduction or radiation. It has a vaccum in between the refill â¦and the wall which stops convection and conduction. The walls are coloured white so that heat does not radiate.
Laboratory flasks are vessels (containers) which fall into the category of laboratory equipment known as glassware. In laboratory and other scientific settings, they are usually referred to simply as flasks.