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A closed system allows energy to leave and enter, but not matter. An isolated system allows neither energy nor matter to leave and enter. In reality, a thermos is a closed system because it does allow for the exchange of small amounts of energy (A hot drink eventually cools down in a thermos). But the ideal thermos would be an isolated system since it wouldn't allow energy to leave or enter.
A thermos is technically an isolated system because there is no exchange of matter or energy between the system (thermos) and surroundings. However, a cold or hot drink in the thermos will eventually get to room temperature. It's very difficult to achieve and build a true, isolated system, but the thermos is still considered one because it hinders matter/energy flow.
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