A container with special insulation that keeps hot drinks hot and cold drinks cold for hours.
Named after 'thermos' from the Greek word 'thermē' meaning 'heat.' The brand name Thermos (capitalized originally) became so popular that it became a generic term for any insulated bottle, similar to how 'kleenex' is used for tissues.
Thermos bottles use a physics principle called a vacuum between two walls—basically trapping heat or cold in an invisible barrier, the same physics that keeps space probes functional in the cold of space!
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