The thermos, or vacuum flask, is a popular device for maintaining the temperature of liquids and even food. Originally designed for beverages, it has evolved to include wide-mouth versions for soups and stews, and even plastic interiors. Despite competition from vacuum packed meals and microwaveable lunches, the traditional thermos remains popular for picnics, camping, and long car rides.
Popular with campers, children, and many office workers who lunch at work, the thermos is a simple device that is a vacuum flask that helps maintain the temperature of the liquid stored in the container. More correctly known as a Dewar flask, the thermos is actually a brand name for this style of flask, but over time it has become the common designation for all devices of this type. Primarily developed for beverages, the thermos can also be used for soups, stews and even cooked vegetables and casserole portions.
The classic Thermos flask is designed with a tempered glass interior that keeps cold drinks cold for several hours. Featuring a small mouth and topped with a screw-on cup, the device was an ideal means of carrying around all types of beverages. The same properties would also maintain the temperature of hot drinks. This has made the thermos an ideal way for adults to take coffee on long trips or to a workplace. Even school-age children could benefit from the thermos, as the flask would keep drinks cold until lunchtime.
Over time, thermoses have been developed for other applications. Wide-mouth thermos bottles can be used to accompany a nutritious meal of soup or stew. Because the food would stay hot, it was also possible to use these versions of the thermos to carry portions of a casserole or cooked vegetables with you. These wide-mouthed types could also be used to carry sweets with them, such as cobblers or combinations of jelly and fruit. Even the glass interiors have been replaced with tempered plastic blends that won’t shatter if the device is accidentally dropped.
While advances in vacuum packed meals and microwaveable lunches have been introduced to the market for many types of vacuum flasks, the traditional beverage thermos continues to be a popular product. People will often bring the thermos for picnics, camping and other outings, or as an easy way to take along a hot chocolate coffee when going on a long car ride.
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