Nowadays, there are ethanol and acetic acid, and the two meet and become transformed. Ethanol is warm in nature, acetic acid tastes acid, and the two combine, like yin and yang.

At the beginning of its change, the ethanol molecule and the acetic acid molecule approach each other, like the guest and the host meet, and the attitude is affinity. The carboxyl group of acetic acid and the hydroxyl group of ethanol seem to embrace each other intentionally, and they are attentive to each other.

During the process, the molecules are active and the energy interacts, as if dancing in an invisible field. The hydroxyl group discards hydrogen, and the carboxyl group also discards the hydroxyl group next to it. The two discarded things combine into water and escape. The rest are connected to form a new structure, which is ethyl acetate.

This change is also based on ethanol and acetic acid, and goes towards the formation of ethyl acetate. Although there are difficulties, given time and suitable conditions, there will be more achievements. Like a craftsman, carefully do it, and finally get a good product. Looking at this change, we can see that the cause of physical properties and the way of change are subtle and mysterious, and cannot be clarified without careful insight and careful consideration.