Write a note about ortho water and para water

Explanation

(i) Water exists in space in the interstellar clouds, in proto-planetary disks, in the comets and icy satellites of the solar system, and on the Earth.
(ii) In particular, the ortho-to-para ratio (OPR) of water in space has recently received attention. Like hydrogen, water can also be classified into ortho-H,0 and para-`H_(2)O`, in which the directions are antiparallel.

(iii) At the temperature conditions of the Earth (300 K), the OPR of `H_(2)O` is 3.
(iv) At low temperatures below (< 50 K) the amount of para-H,O increases. It is known that the OPR of water in interstellar clouds and comets has more para-`H_(2)O` (OPR = 2.5) than on Earth.