termosed

Termosed refers to a type of insulated container designed to maintain the temperature of its contents. The most common form is a thermos flask, which is a bottle with a vacuum between two walls. This vacuum significantly reduces heat transfer through conduction and convection, thus keeping hot liquids hot and cold liquids cold for extended periods. The inner and outer walls are typically made of glass or stainless steel, and the vacuum layer is the key to its insulating properties. The top of a thermos flask is usually sealed with a stopper or lid to further minimize heat loss or gain.

The principle behind the thermos was developed by Sir James Dewar in 1892, who invented the vacuum flask. While Dewar developed it for scientific purposes, Reinhold Burger later commercialized it for everyday use in 1903, coining the term "Thermos" as a brand name. Over time, "thermos" became a generic term for such insulated containers. Thermoses are widely used for beverages like coffee, tea, and water, as well as for food items like soup. They are popular for travel, picnics, and outdoor activities. Modern thermoses are often made with durable materials like stainless steel and come in various sizes and designs.