For example, gas is countable and uncountable. Then, can 'much gas' always be translated into 'many gases'? Oh, look at that! there's a cloud of many gases!

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    This should answer your question, as 'gas' and 'gases' is the same issue as with 'water' and 'waters'. Water, a water and waters – Astralbee Dec 21 '20 at 9:39
  • No, I mean a word that can be countable and uncountable. – user126927 Dec 21 '20 at 9:42
  • And I want to express uncountable nouns' senses with countable nouns. – user126927 Dec 21 '20 at 9:44
  • Yes, 'gas' and 'water' can be used the same way. You can say "some gas" or "some water"; you can say "gases" and "waters" and in very specific contexts you can say "a water". – Astralbee Dec 21 '20 at 10:27
  • @Astralbee When I use a plural noun, should it mean different types? The answer below says it does. – user126927 Dec 21 '20 at 10:29

Much gas refers to a large amount, possibly of only one type. Many gases refers to many different types of gas, for example hydrogen, helium, chlorine, nitrogen, water vapour, etc. Both can be correct in different contexts, but they are not interchangeable.

  • Should it be necessarily different types? or generally? – user126927 Dec 21 '20 at 10:25
  • I can't think of a situation where you would talk about 2 gases if they were the same type of gas. – Peter Dec 21 '20 at 10:35
  • Just imagine a cloud of some gases. The same type. – user126927 Dec 21 '20 at 10:37
  • Then you wouldn't use the plural. – Peter Dec 21 '20 at 10:45
  • But we use 'ashes.' One type. – user126927 Dec 21 '20 at 10:49

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