Thermodynamics

Galerie de flocons de neige, par Jerome Mathey et Valérian Mazataud. 2007 . voir Galerie de photos de flocons ou neige

Heard that it's going to be 0 degC tonight, had the notion of being isothermal at 0 degC then I googled it up and found out that adiabatic is more accurate ...

An isothermal process is a change in which the temperature of the system stays constant: ΔT = 0. This typically occurs when a system is in contact with an outside thermal reservoir (heat bath), and the change occurs slowly enough to allow the system to continually adjust to the temperature of the reservoir through heat exchange. An alternative special case in which a system exchanges no heat with its surroundings (Q = 0) is called an adiabatic process. In other words, in an isothermal process, the value ΔT = 0 but Q ≠ 0, while in an adiabatic process, ΔT ≠ 0 but Q = 0.
http://en.wikipedia.org/wiki/Isothermal