Change in temperature. 1) A simple representation of the mean lapse rate within a layer of the atmosphere, obtained by calculating the difference between observed temperatures at the bottom and top of the layer. Delta Ts often are computed operationally over the layer between pressure levels of 700 mb and 500 mb, in order to evaluate the amount of instability in mid-levels of the atmosphere. Generally, values greater than about 18 indicate sufficient instability for severe thunderstorm development. 2) The difference in temperature between the surface of a lake and 850mb, typically used to determine lake effect snow potential.

the difference between dynamical time and Universal Time; specifically the difference between Terrestrial Dynamical Time (TDT) and UT1: T = TDT-UT1.

Difference of hot and cold plate temperatures in °C or °F..

Demand Demand side management (DSM)