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CBSE Class 11-science Answered

explain formation of dewar flask 
Asked by srivatsasubramaniam | 19 Dec, 2018, 03:43: PM
answered-by-expert Expert Answer
Dewar flask is a kind of thermas flask which use vacuum instead of any insulating material between wall of flask. Dewar flask is designed to hold cryogenic liquids like helium, nitrogen  which has lower boiling point than room temperature. 
Answered by Ankit K | 19 Dec, 2018, 10:13: PM
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