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= dQ/T, since the Second Law defines the direction of a chemical or

Sensible heat Thermal energy that can be 'sensed' (e.g. with a thermometer) and which can be transferred into the air through conduction and convection, causing a change in temperature.

Sidereal day Time interval between the motion of a point across a specified meridian. Sinks Reservoirs occurring in nature in which certain materials can be stored as part of

the circulation of them through the global environment, e.g oceans are a primary sink for carbon.