Hello. 1.
น้ำหอม is caused by a chemical synthesis process.
น้ำมันหอมระเหย are produced by distillation from natural plants. with the type of
น้ำหอม that is caused by chemical synthesis Or caused by nature. Longevity depends on the nature of the substance that smells. (Whether from nature or synthetic) that the molecular characteristics One of the important factors is molecular weight of that substance