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单词 Halflife
释义

Halflife

原声例句
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Caffeine also has a halflife of around 6 hours, so if you drank a standard coffee with around 150mg of caffeine, after about 6 hours there will only be 75mg left in your system and you'll be feeling half of the effect.

咖啡因也有大约6个小时的半衰期,所以如果你喝了一杯标准规格的,含大约150毫克咖啡因的咖啡,在6小时后就仅有75毫克留在身体内,而咖啡因的影响也会减半。

中文百科

半衰期 Half-life

(重定向自Halflife)

半衰期是指某种特定物质的浓度经过某种反应降低到剩下初始时一半所消耗的时间,半衰期是研究反应动力学的一个容易测定的重要参数,数学上可以证明,只有一级反应的半衰期是恒定的数值,且知悉一个一级反应的半衰期便可以计算出该反应的所有动力学参数,所以人们通常只关心一级反应的半衰期。常见的一级反应有:放射性核素的衰变、一级化学反应、药物在体内的吸收和代谢等。

英语百科

Half-life 半衰期

(重定向自Halflife)
Simulation of many identical atoms undergoing radioactive decay, starting with either 4 atoms per box (left) or 400 (right). The number at the top is how many half-lives have elapsed. Note the consequence of the law of large numbers: with more atoms, the overall decay is more regular and more predictable.
Half life demonstrated using dice in a classroom experiment
Demi-vie (médiane) et durée de vie moyenne (espérance) d'une population ayant une décroissance exponentielle.
Exponentielle Abnahme einer zerfallenden Stoffmenge eines radioaktiven Nuklids mit Halbwertszeit

Half-life (t1⁄2) is the time required for the amount of something to fall to half its initial value. The term is very commonly used in nuclear physics to describe how quickly unstable atoms undergo decay, or how long stable atoms survive, radioactive decay, and it is also used more generally of any type of exponential or non-exponential decay. The converse of half-life is doubling time.

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更新时间:2025/6/22 15:08:12