Dependent on temperature 0% - extremely dry Antartica or desert (probably more like 2-10%) 100% - extremely wet tropical rain forest raining psychrometer- dry bulb- measures regular air temperature wet bulb- measures cooling temperature use ESRT to identify RH talk about curly hair stretches when the humidity is high bad hair day, uncontrollable Dew Point definition- the temperature that the air will condense to create dew also known as fog, clouds etc ESRT table Requires a nuclei or surface ...