1, one 100g big steamed bread has about 236 kilocalories, so the calories of two big steamed buns are 472 kilocalories.

2. When the change of system state comes from the destruction of thermal equilibrium conditions, that is, there is a temperature difference between the system and the outside world, we say that there is thermal interaction between the system and the outside world, and the result of the interaction is that energy is transferred from a high-temperature object to a low-temperature object. The energy transferred at this time is called heat.

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