即指一日一夜，24个小时。在地球不同地方，有时候一昼夜不仅仅指的是二十四小时！比如在南极与北极，有些时候一年就是一个大昼夜，半年白天，半年黑夜。
人间五十年，是四大王天天神的一昼夜。
Fifty human years are equal to one day & night among the Devas of the Four Great Kings.
一昼夜根系水势呈现出降-升-降-升有规律的变化；
The diurnal change of water potential and water content of roots at dry side opposed to the transpiration.
所有的这些周期被人们统称为昼夜节律，一般以24小时一昼夜为一个循环。
Collectively, these cycles are known as circadian rhythms and are generally tied to the 24-hour day-night cycle.
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