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It all comes down to whether you can stick a number in front of it. You can have 5 computers, or infinite computers, so you talk about the number of computers. If you have sand, you can't have 5 sands or infinite sands, so you can't talk about the number of sands. Instead, you talk about the amount of sand (at which point it would be infinite sand, not infinite sands).
Now, you can talk about 5 grains of sand or infinite grains of sand, so it's the number of grains, not amount of grains, even though it would be amount of sand.
In any case, all grammar - English or otherwise - can get quite complicated, though English is probably worse than many since it combines so many languages while other languages tend to be more consistent since they aren't derived from so many different sources.






Member since:
2005-11-18
You didn't catch the "infinite"...? "
I think he meant to say that 'amount' is for mass mouns, while 'number' is for count nouns.
Mass nouns are mostly for things that are physically impossible or nearly impossible to count, such as water or grains.