write one use of thermos flask
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One use of thermos flask is to maintain the temperture of any liquid such as water ,tea or any such thing. It keeps hot thing hot and cold thing cold.
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hiiii mate
A cryogenic storage dewar of liquid nitrogen, used to supply a cryogenic freezer.
Vacuum flasks are used domestically to keep beverages hot or cold for extended periods of time and for many purposes in industry.
A cryogenic storage dewar of liquid nitrogen, used to supply a cryogenic freezer.
Vacuum flasks are used domestically to keep beverages hot or cold for extended periods of time and for many purposes in industry.
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