why thermos flask is an isolated
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In an isolated system, both matter and energy (ie., Heat) cannot be exchanged between the system and the surrounding. ... In a THERMOS FLASK, when we keep hot water, it doesn't lose it's heat for a pretty long time. Here matter and heat are not exchanged between the system and surrounding. So it is an ISOLATED SYSTEM.
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In an isolated system, both matter and energy (ie., Heat) cannot be exchanged between the system and the surrounding. ... In a THERMOS FLASK, when we keep hot water, it doesn't lose it's heat for a pretty long time. Here matter and heat are not exchanged between the system and surrounding. So it is an ISOLATED SYSTEM.
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