[QUOTE=freezeframe;734482]Concrete doesn't mean "something you can hold". Atoms are concrete. Jupiter is concrete.
Wow! Hostile,inappropriate,rude...quite a handful! .I type in blocs only when I launch through my tiny-keyed mobile phone which makes cap lock/unlock a bit herculean.
If fire is concrete because of its "physical properties" then air,water,gas,flame,oil,ray,reflection,refraction, etc are all concrete nouns,aren't they?
Going by your physical property theory,don't you think that proper,common and even collective nouns all have physical properties? Or,can we say they are also concrete?
Or,maybe we could say "all nouns,excluding abstract,are concrete...I think the truth is that we all are either too by-the-book or too indolent to accept the fact that some nouns fall outside our perennial coverage areas(abstract,proper,common,collective,countable, non-countable etc) I think some nouns fit into more than one of the above-listed classes.Where does this lead us?... improvised pairings such as NON-COUNTABLE CONCRETE,COUNTABLE CONCRETE etc.Let's try and re-classify these words:fire,gas,molecules