List of Quantities and Units

(Bold symbols describe vector quantities.)

Symbol Name Unit a (Relative) activity 1 a Reciprocal heat capacity K J−1 A Area m2 A Helmholtz energy J A Preexponential factor (m3 mol−1)n −1 s−1 b Half-width s c Constant (general) Depends c Specific heat capacity J g−1 K−1 ci Sensitivity coefficient Output unit/input unit C Electric capacitance F C Heat capacity J K−1 Cc Convection coefficient W m−2 K−1 Cht Coefficient of heat transfer W m−2 K−1 d Degree of freedom d Distance m e Error Same as corresponding quantity e Specific energy J kg−1 E Energy J f Frequency s−1 f Force N F Fraction melted 1 g Acceleration due to gravity (9.81 m s−2) m s−2 G Gibbs energy J G Thermal conductance W K−1 h Specific enthalpy J kg−1 H Enthalpy J Hs,V Volumetric superior calorific value kWh m−3 I Electric current A J Heat flux W m−2 Jq Heat flux field W m−2 k Coverage factor k Rate constant (m3 mol−1)n −1 s−1 k0 Preexponential factor (m3 mol−1)n −1 s−1 K Calibration factor Output unit / input unit K Missing heat of fusion J K12 Empirical radiation exchange coefficient m−2 KΦ Heat flow calibration factor 1 or W K−1 KQ Heat calibration factor 1 or J K−1 s−1 l Length m L Angular momentum J s m Mass kg M Molar mass kg mol−1 n Amount of substance mol n Order of reaction 1 N Number of entities 1 NGr Grashof number 1 p Pressure Pa p Momentum kg m s−1 P Power W q Electric charge C q Specific heat J kg−1 Q Electric charge C Q Heat J r Correlation coefficient 1 r Position vector m R Electric resistance Ω R Molar gas constant ((8.3144621±0.0000075) J K−1 mol−1) J K−1 mol−1 Rth Thermal resistance K W−1 s Standard deviation Same as corresponding quantity S Entropy J K−1 S Seebeck coefficient V K−1 t Time s T Temperature K (or °C) u Uncertainty Same as corresponding quantity U Voltage V U Internal energy J v flow rate m3 s−1 v Velocity m s−1 V Volume m3 (or l) wc Degree of cystallinity 1 W Work J x Mole fraction 1 x Position coordinate (general) m

Greek Symbols

α Cubic expansion coefficient K−1 α Degree of reaction 1 β Heating rate K s−1 (or K min−1) ηdyn Dynamic viscosity Pa s λ Thermal conductivity W m−1 K−1 μ Chemical potential J mol−1 φ Phase shift rad ϕ Electric potential V Φ Heat flow rate W Π Peltier coefficient V ρ Density kg m−3 (or g cm−3) σ Standard deviation Same as corresponding quantity σ Surface tension J m−2 σB Stefan–Boltzmann constant ((5.670373±0.000021) × 10−8 W m−2 K−4) W m−2 K−4 ϑ Temperature °C Θ Temperature °C τ Time constant s ω Angular velocity rad s−1 ω Angular frequency rad s−1

Indices and...