MOL
n. countablen. a standard unit in science used to measure the amount of a substance. It helps scientists count very tiny things like atoms or molecules by grouping them into a specific, large number.
n. the SI base unit for the amount of a substance, defined as exactly 6.02214076 × 10²³ elementary entities. Used to express the magnitude of chemical reactions and the proportions of elements in a compound.
Usage
Often followed by 'of' and the name of a specific element or molecule.
Pitfall
three mol of waterthree moles of waterWhile 'mol' is the official scientific symbol, the full word 'moles' should be used in standard English sentences.
Last updated May 8, 2026