You can’t say “one popcorn” or “two popcorn” because mass nouns aren’t countable. It’s just “popcorn” for any amount of popcorn. Notice I said “amount” and not “number” because, again, popcorn is a mass noun and cannot be enumerated. If you want to enumerate kernals of popcorn, you have to say “kernels of popcorn”.
It’s a singular mass noun like sand. Do you say “popcorns”?
The sands of time.
I would like one sack of sands, please.
https://youtu.be/YGqdjaz2Upg
It’s like fish and sheep. One popcorn, two popcorn, a bag of popcorn.
You can’t say “one popcorn” or “two popcorn” because mass nouns aren’t countable. It’s just “popcorn” for any amount of popcorn. Notice I said “amount” and not “number” because, again, popcorn is a mass noun and cannot be enumerated. If you want to enumerate kernals of popcorn, you have to say “kernels of popcorn”.