Later I heard that the price of an eye exam at target optical may vary from $29 to $229. So I think this may be the reason that why I can't find the price on the internet. if you want to have an eye exam at target optical, I strongly suggest you to make a call to know the exact price for en eye exam in that store.
Water does not commonly form a gas, but rather a vapor which is slightly different (but really just the name of a gas that is normally a liquid). - There is latent heat in water so you can remove energy without changing the temperature of the water (only exactly at a phase change though).
This change of phase (from a liquid to a gas) requires heat, called latent heat. When water evaporates, it removes heat, lowering the temperature of whatever the water was in contact with. For both water and land surface, most of this heat energy comes from the surface, not from the air.