# If something is not hydrophilic, is it necessarily hydrophobic?

Is it possible to create hydrophobic water?

Two species are phobic within some medium under some conditions when they don't here together (cohere if they're the same species; adhere otherwise). To be clear: phobic species don't really repel so much as they're not very attracted to each other. Species can become self-phobic. Of course, it's important to remember that members of the species aren't repulsing others of their own kind so much as just aren't very attracted to them. And then since they're not really attracted, they do the natural thing and just tend to disperse, filling the volume containing them. In other words, they vaporize. Water can be vaporized, e.g. through heating.

In the question I linked above the third answer says that since the water molecules do not attract each other in gaseous state they are hydrophobic. Even if the water molecules are not hydrophilic are they thus necessarily hydrophobic?

• Otoh. water condenses from the gas phase, so it must be hydrophilic. ;) You see these categories make no sense for gases.
– Karl
Jul 7 at 12:59
• To address the title itself, being hydrophilic/hydrophobic is rather being somewhere on a continuous gray scale than inside of either black either white box. Jul 8 at 9:26

Water molecules in a gaseous phase have still strong attraction during their collisions, what reflects in vapor being far from an ideal gas. The estimated boiling point of water, assuming absence of hydrophilic hydrogen bonds, is about $$\pu{-120 ^{\circ}C}$$. This gives some idea what makes pure water vapor to condensate at $$\pu{+100 ^{\circ}C}$$ ( at $$\pu{101 325 Pa}$$ ).