The answer to all our collective, rapidly cooling hot drink woes? A vacuum-insulated flask. Think of a vacuum flask as a cup within a cup. The space between the two vessels is evacuated of any air, ...

This clip shows how a vacuum flask prevents heat loss. Detail of the design of the flask to prevent conduction, convection, radiation and evaporation is given. This includes the vacuum ...

A vacuum-flask maker rises and falls with polls favouring Harris, while an aviation software company gets a Trump bump.

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