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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.
Flasks and beakers are typically used to hold liquids. The indicated measurements are designed to be approximate with a margin of error. The markings or calibrations on a graduated cylinder are more precise and accurate, but should not be used if the cylinder is less than 50 percent full.