sentence2_structure: vacuum-insulated reaction flask<>approximates<>the condition of a isolated system$$$neither matter nor heat<>can be exchanged<>a isolated system
sentence1: Components of a solar thermal system can include collectors to collect and transform the heat of the sun, an insulated storage system to store the heated water, heat exchangers, and pipes to transport heated liquid.
sentence2: A sealed, vacuum-insulated reaction flask approximates the condition of a isolated system, in which neither matter nor heat can be exchanged between system and surroundings.
question: A sealed, vacuum-insulated reaction flask approximates what condition, in which neither matter nor heat can be exchanged between system and surroundings?