What is James Dewar best known for inventing?
Thermometer
Vacuum flask
Microscope
Telescope
Answer
The vacuum flask, also known as a Dewar flask, is a laboratory glassware invented by Scottish scientist James Dewar in 1892. It is designed to minimize heat transfer between its contents and the surrounding environment, making it ideal for storing substances at extreme temperatures. The flask consists of two layers of glass with a vacuum between them, which prevents heat transfer by conduction and convection.
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