儿子“:物理变化和化学变化有什么不同?”爸爸:“物理变化就是没有了还会再有,化学变化就是没有了就永远没有了。”儿子“:听不懂。”爸爸:“我觉得花钱就是化学变化,但你妈认为是物理变化。” Son “: What is the difference between physical change and chemical change? ” Dad: “The physical change is no more, the chemical change is never gone.” “Son”: do not understand. “Dad: ” I think spending money is a chemical change, but your mom thinks it’s a physical change. “”