Thermos flask (or thermos cup), its wall is made of double glass, and the double glass is vacuum (vacuum does not conduct heat, that is: the hot water is isolated from the outside by vacuum, the hot water is not easy to become cold. To achieve the purpose of heat preservation), and its cover is generally poor thermal conductivity (such as wood, hollow plastic, etc.).
The thermos is composed of an inner container, an outer shell and additional parts.
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