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).
a physical change. because the water is still water just the appearance of it has changed. It is also known as a phase change because the boiling is just a phase once it is off the heat it will be normal water and if you freeze it it will become ice, but once you leave it out again its just water.