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What was Dewar's contribution to cryogenics?

Invented cryogenic gloves
Liquefied gases
Developed cryogenic engines
Created cryogenic chambers

Answer

Liquefied gases were James Dewar's significant contribution to cryogenics. He developed the first vacuum flask, known as the Dewar flask, which enabled the storage and transportation of liquefied gases. This innovation revolutionized the field of cryogenics, allowing for the study and application of extremely low temperatures. Dewar's work paved the way for advancements in various scientific disciplines, including physics, chemistry, and biology.