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Thermos Bottle Day is observed every year on February 26. Since the company was founded in the early 1900s, the name Thermos has become synonymous with the vacuum flask. Now all products with similar uses come under the eponym ‘thermos.’ Thermos bottles are flasks specially designed to ensure that hot liquid stays hot and cold liquid remains cold. Thermos now produces a variety of items, such as food jars, mugs, tumblers, coolers, and lunch boxes. The Thermos consists of two compartments, one inside the other. There is a space from which air is partially evacuated, leaving a vacuum. This prevents cold or heat from escaping, which is why liquids can remain hot or cold for long periods.