Can I say different water, different humidity, ...? My question is whether different can be directly used with an uncountable noun while no words, such as kinds of, ect., are added between different and the uncountable noun. Thank you.

Remember that our relative humidity stands for a numerically quantifiable measure after all—e.g. try “differing” humidity instead.  But your initial concern “different” water presents such interpretive challenge here as perhaps someone’s arbitrary euphemism for “strange” or “dirty” water.

Hmmmmm got it .

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Homson - 14 November 2008 12:35 AM

Can I say different water, different humidity, ...? My question is whether different can be directly used with an uncountable noun while no words, such as kinds of, ect., are added between different and the uncountable noun. Thank you.

Yes, it can be used directly with an uncountable noun.  When so used, it can mean either:

(a) of a different kind or magnitude, e.g.
This is different butter from what I normally eat.
This contrasting photograph was taken in different light.
He would prefer to do different work.

or (b) physically distinct, e.g.
If you come back tomorrow, you will see the same river but different water.