A well stoppered thermos flask contains some ice cubes. This is an example of

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Closed system

Open system

Isolated system

Non-thermodynamic system

answer is C.

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Detailed Solution

Closed system: Exchange of energy takes place with surroundings but not matter

Open system : Exchange of matter and energy takes place with surroundings

Isolated system: No exchange of matter or energy takes place with surroundings

Non-thermodynamic system: A non-thermodynamic system is one that is not in a condition of thermodynamic equilibrium.

Because the thermo flask generates a vacuum-like environment, no energy or matter can be transformed in it

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