Modern industry needs considerable quantities of this metal, either in the form of iron or in the form of steel.
This metal = iron
Is "quantities" interchangeable with "amount"? What is the difference between quantity/quantities and amount?
Supercat Is "quantities" interchangeable with "amount"? It's interchangeable with "amount s ". ) Supercat What is the difference between quantity/quantities and amount?
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SupercatIs "quantities" interchangeable with "amount"?
It's interchangeable with "amounts". (Don't forget it's plural in your example.)
SupercatWhat is the difference between quantity/quantities and amount?
"quantity" can be used for both countable and non-countable nouns; "number" is used for countable nou