Full Idea
Emergent properties are said to be irreducible to, and unpredictable from, the lower-level phenomena from which they emerge (as weight is a 'resultant' property, but the transparency of water is an 'emergent' property).
Gist of Idea
Is weight a 'resultant' property of water, but transparency an 'emergent' property?
Source
Jaegwon Kim (Philosophy of Mind [1996], p.228)
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.228
A Reaction
So weight is predictable, but transparency is a surprise? But presumably the transparency of water is totally predictable, once you understand it. Emergent properties are either dualist or reducible, in my view.