Sublimation
A change of phase from solid to gas without passing through the liquid phase.Subshell
Subshell
The division of electron shells or energy levels defined by a particular value of the azimuthal
quantum number; e.g., s, p, d, and f subshells. Composed of orbitals. Also called sublevels. See
Orbital.
Surroundings
Surroundings
All matter and energy in the universe not included in the particular system under consideration.System
System
The matter and energy under consideration.Temperature
Temperature
A measure of the average energy of motion of the particles in a system.Third law of thermodynamics
Third law of thermodynamics
The law stating that the entropy of a perfect crystal at absolute zero is zero.Titrant
Titrant