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An isolated system is coffee in a sealed thermos because neither energy nor mass (coffee) can leave/enter. A closed system is coffee in a sealed cup, because it can exchange energy in the form of heat with the surroundings, but it still cannot exchange mass.
A closed system has a fixed amount of matter within it, but it can exchange energy with its surroundings. The coolant in a refrigerator coil is an example of a closed system because the type of matter doesn't change (coolant) and there is an energy exchange (temperature of refrigerator). Isolated systems can exchange neither energy or matter with its surroundings, essentially having no contact with its surroundings. The coffee in a insulated thermos is an example of an isolated system because the type of matter doesn't change (coffee) and there is no energy exchange with the surroundings (coffee stays the same temperature).
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