Assertion: thermos | /r/HasProperty | a vacuum flask
Facets:
Source sentences:
text: Popular among campers, kids, and many employees who take lunches to work, the thermos is a simple device that is a vacuum flask that helps to maintain the temperature of the liquid stored within the container.
text: A thermos (also known as a Dewar flask, Dewar bottle or vacuum flask) is an insulating storage vessel that maintains the temperature of the substanceand enables hotter or cooler temperatures than the flask’s surroundings.
text: The Thermos, a vacuum flask adapted for lunch box use, was introduced in 1904.