The piston is now forced down, the burned gases expanding approximately adiabatically.
这时点燃的气体作近似的绝热膨胀而向下推动活塞。
So when I expand this gas adiabatically and it cools down, why do you think it might cool down?
现在我们知道了气体绝热膨胀时，温度会下载，为什么会降温？
A quantal system with Hamiltonian which varies adiabatically with time obeys the adiabatic theorem, but the state of the system is not a stationary state having the stable property.
哈密顿量随时间绝热改变的量子系统遵循绝热定理，但系统波函数不具有定态的稳定性质，它们不是定。
A quantal system with Hamiltonian which varies adiabatically with time obeys the adiabatic theorem, but the state of the system is not a stationary state having the stable property.
哈密顿量随时间绝热改变的量子系统遵循绝热定理，但系统波函数不具有定态的稳定性质，它们不是定。
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