Amount of substance

The concept of the unit the mole and its quantity amount of substance are specific to chemistry.
While units like metre, second, etc. are common in everyday life, the mole is not.
The word amount is common, but is used loosely to apply to mass (the amount of coal ordered was 200 tonnes), volume ( the amount of milk consumed daily was 60 litres), or in other ways (the amount of drink ordered was 200 bottles of wine and 300 cans of beer).

Unfortunately there is no word in the English language for the amount of substance in this specific chemical sense. (Chemical amount which has been suggested has much to recommend it.)
This fact, and the reluctance of chemistry teachers to use its symbol, n, in chemical calculations other than for gases, has caused problems and difficulties for generations of students.
Fortunately this situation has changed or is changing in some countries.