https://www.youtube.com/watch?v=ZAWUX-8wPsA
原文描述：
► The mole (not the animal) is an SI unit that measures the amount of substance. One mole contains exactly 6.022 × 10^23 (602 214 076 000 000 000 000 000) elementary entities. This figure is the fixed numerical value of Avogadro's constant. The concept of the mole is of vital importance in chemistry, since, among other things, it allows one to make a multitude of stoichiometric calculations.
► In this video we put into perspective a mole of different substances such as Iron, Oxygen or Carbon. But we also go a little further by representing other elements outside of chemistry to better understand the enormous number that is Avogadro's number.
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