I found this article quite helpful in explaining the issue
Student or Learner
I want to know the mean of "magnification" in "Magnification of cooling water". So would anybody explain for me, please? Thanks so much!
I thought you can only magnify images which you view rather than actual physical objects/material.
Magnify is also used in this sense for many abstract things:
"You're magnifying the differences that really exist".
"The attorney tried to magnify how bad the defendant was".
In these cases, it means "to make appear bigger".
Perhaps in the context (which we still haven' got ) 'cooling water' is in apposition to another noun, and acts like an adjective - as in 'cooling water systems' or 'cooling water equipment'. 'Magnification' here would simply mean 'making bigger' (which it originally did - Latin [=big] - though, come to think of it, magnus had an irregular comparative, so it should be [BUT ISN'T] *majorification.) Here is an example with this meaning:
'The magnification of cooling water systems in buildings that are already intrinsically wasteful is not cost effective. For example, installing blinds in rooms facing the midday sun would be cheaper.' (This is very badly written, but some people write like that.) The stress here would be on the 'cooling'.)
Alternatively, 'magnification' could mean 'enlargement' in an optical sense - 'magnification of cooling water' (with stress on the 'water') could mean putting a drop of water under a microscope and studying it while it cools.
Context, context, context.
may they're wrong. I can only think so. May it's multiple.
Can you give us the full sentence in which you met this?