IUPAC Gold Book - Quantities

Quantities

A B C D E F G H IJK L M N O P QRS TUV WXYZ

quantity	symbol	referenced in	equation
radiance, $L$	$Math - apply$	fluence rate, $E o$	$E o = ∫ 4 π L ⁢ d Ω$
		fluence rate, $E o$	$L$
		irradiance (at a point of a surface), $E$	$L cos ⁡ θ d Ω$
		irradiance (at a point of a surface), $E$	$L$
		irradiance (at a point of a surface), $E$	$E = ∫ 2 π L cos ⁡ θ ⁢ d Ω$
		radiance, $L$	$L = d 2 P d Ω d S ⊥ = d 2 P d Ω d S cos ⁡ θ$
		radiance, $L$	$L = ∫ λ L λ ⁢ d λ$
radiant energy, $Q$	$Math - apply$	photon number, $N p$	$N p = Q h ν$
		photon number, $N p$	$Q$
		radiant energy, $Q$	$Q = ∫ Q λ ⁢ d λ$
		radiant energy, $Q$	$Q = P t$
		radiant exposure, $H$	$H = d Q / d S = ∫ t E ⁢ d t$
		radiant exposure, $H$	$H = Q / S$
		radiant power, $P$	$P = d Q / d t$
		radiant power, $P$	$P = Q / t$
radiant energy density, $ρ$ , $w$	$Math - math$	radiant energy density, $ρ$ , $w$	$ρ$
	$Math - math$	radiant energy density, $ρ$ , $w$	$w$
radiant (energy) flux, $P$ , $Φ$	$Math - math$	radiant (energy) flux, $P$ , $Φ$	$P$
	$Math - math$	radiant (energy) flux, $P$ , $Φ$	$Φ$
radiant exitance, $M$	$Math - math$	radiant exitance, $M$	$M$
		radiant exitance, $M$	$M = d P / d S$
		radiant exitance, $M$	$M = P / S$
		radiant exitance, $M$	$M = ∫ λ M λ ⁢ d λ$
radiant exposure, $H$	$Math - math$	radiant exposure, $H$	$H$
		radiant exposure, $H$	$H = d Q / d S = ∫ t E ⁢ d t$
		radiant exposure, $H$	$H = Q / S$
		radiant exposure, $H$	$H = E t$
radiant intensity, $I$	$Math - math$	radiant intensity, $I$	$I$
		radiant intensity, $I$	$I = d P / d Ω$
		radiant intensity, $I$	$I = P / Ω$
		radiant intensity, $I$	$I = ∫ λ I λ ⁢ d λ$
radiant power, $P$	$Math - math$	fluence rate, $E o$	$P$
		fluence rate, $E o$	$E o = d P d S = d H o d t$
		fluence rate, $E o$	$E o = P S$
		irradiance (at a point of a surface), $E$	$P$
		irradiance (at a point of a surface), $E$	$E = d P d S$
		irradiance (at a point of a surface), $E$	$E = P S$
		radiance, $L$	$L = d 2 P d Ω d S ⊥ = d 2 P d Ω d S cos ⁡ θ$
		radiance, $L$	$d P / ( d S cos ⁡ θ )$
		radiance, $L$	$P / S cos ⁡ θ$
		radiant energy, $Q$	$Q = P t$
		radiant exitance, $M$	$M = d P / d S$
		radiant exitance, $M$	$M = P / S$
		radiant intensity, $I$	$I = d P / d Ω$
		radiant intensity, $I$	$I = P / Ω$
		radiant power, $P$	$P$
		radiant power, $P$	$P = d Q / d t$
		radiant power, $P$	$P = Q / t$
radiative lifetime, $τ 0$	$Math - math$	radiative lifetime, $τ 0$	$τ 0$
rate of conversion, $ξ .$	$Math - math$	rate of conversion, $ξ .$	$ξ .$
		rate of conversion, $ξ .$	$ξ . = d ξ d t$
		rate of conversion, $ξ .$	$ξ . = d ξ d t = 1 ν i d n i d t$
		rate of reaction, $v$	$ξ . = d ξ d t$
		rate of reaction, $v$	$ξ . = − 1 a d n A d t = − 1 b d n B d t = 1 p d n P d t = 1 q d n Q d t$
	$Math - math$	rate of reaction, $v$	$ξ$
rate of fluid consumption, $q V$ in flame emission and absorption spectrometry	$Math - math$	rate of fluid consumption, $q V$ in flame emission and absorption spectrometry	$q V$
rate of reaction, $v$	$Math - math$	rate of reaction, $v$	$v$
		rate of reaction, $v$	$v = − 1 a d [A] d t = − 1 b d [B] d t = 1 p d [P] d t = 1 q d [Q] d t$
reactance, $X$	$Math - math$	reactance, $X$	$X$
reaction cross-section, $σ r$	$Math - math$	reaction cross-section, $σ r$	$σ r$
		reaction cross-section, $σ r$	$σ r = P r π b max 2$
reduced mass, $μ$	$Math - math$	reduced mass, $μ$	$μ$
reflectance, $ρ$	$Math - math$	reflectance, $ρ$	$ρ$
		reflectance, $ρ$	$ρ λ = P λ refl P λ 0$
		reflectance, $ρ$	$ρ λ = ( n 1 − n 2 ) 2 ( n 1 + n 2 ) 2$
refractive index, $n$	$Math - math$	molar refraction, $R$	$n$
		molar refraction, $R$	$R = V m n 2 − 1 n 2 + 2$
relative atomic mass (atomic weight), $A r$	$Math - math$	relative atomic mass (atomic weight), $A r$	$A r$
relative density, $d$	$Math - math$	relative density, $d$	$d$
relative molecular mass, $M r$	$Math - msub$	osmotic pressure, $Π$	$Π = c B R T = ρ B R T M B$
		osmotic pressure, $Π$	$M B$
	$Math - math$	relative molecular mass, $M r$	$M r$
relative permeability, $μ r$	$Math - math$	relative permeability, $μ r$	$μ r$
relative permittivity, $ɛ r$	$Math - math$	Drude–Nernst equation (for electrostriction)	$ɛ r$
		Drude–Nernst equation (for electrostriction)	$Δ V el = − ( z e ) 2 2 r ɛ r ∂ ( ln ɛ r ) ∂ p$
		Drude–Nernst equation (for electrostriction)	$ln ɛ r$
		Drude–Nernst equation (for electrostriction)	$∂ ( ln ɛ r ) ∂ p$
		Gibbs energy of photoinduced electron transfer	$w D +• A −• J = z D +• z A −• e 2 4 π ɛ 0 ɛ r a$
		Gibbs energy of photoinduced electron transfer	$w DA J = z D z A e 2 4 π ɛ 0 ɛ r a$
		Gibbs energy of photoinduced electron transfer	$ɛ r$
		Gibbs energy of photoinduced electron transfer	$w D +• A −• = N A μ 2 4 π ɛ 0 ρ 3 ɛ r − 1 2 ɛ r + 1$
		Gibbs energy of photoinduced electron transfer	$Δ ET G o = N A e ( E ox o − E red o ) + z A − z D − 1 e 2 4 π ɛ 0 ɛ r a − Δ E 0,0$
		relative permittivity, $ɛ r$	$ɛ r$
relative retardation, $R rel$ in planar chromatography	$Math - math$	relative retardation, $R rel$ in planar chromatography	$R rel$
		relative retardation, $R rel$ in planar chromatography	$R rel = R F i R F st = b i b st$
		relative retardation, $R rel$ in planar chromatography	$R rel$
relative retention, $r$ in column chromatography	$Math - math$	relative retention, $r$ in column chromatography	$r$
		relative retention, $r$ in column chromatography	$r = V R i ' V R st ' = V N i V N st = t R i ' t R st ' = k i k st$
residence time (hydraulic retention time), $t r$ in biotechnology	$Math - math$	residence time (hydraulic retention time), $t r$ in biotechnology	$t r$
residual emission anisotropy	$Math - math$	residual emission anisotropy	$r ∞$
		residual emission anisotropy	$r t = ( r 0 − r ∞ ) exp ( − t τ c ) + r ∞$
resistance, $R$	$Math - math$	resistance, $R$	$R$
resistivity, $ρ$	$Math - math$	resistivity, $ρ$	$ρ$
resolving power, $R$ in optical spectroscopy	$Math - math$	resolving power, $R$ in optical spectroscopy	$R$
response time, $τ R$ of a detector	$Math - math$	response time, $τ R$ of a detector	$τ R$
	$Math - math$	response time, $τ R$ of a detector	$τ R$
responsivity, $R$ in detection of radiation	$Math - math$	responsivity, $R$ in detection of radiation	$R$
retardation factor, $R$ in column chromatography	$Math - math$	retardation factor, $R$ in column chromatography	$R$
		retardation factor, $R$ in column chromatography	$R = 1 k + 1$
		retention factor, $k$ in column chromatography	$κ = log 10 k = log 10 1 − R R$
retardation factor, $R F$ in planar chromatography	$Math - math$	retardation factor, $R F$ in planar chromatography	$R F$
		retardation factor, $R F$ in planar chromatography	$R F = b a$
	$Math - math$	retardation factor, $R F$ in planar chromatography	$h R F$
	$Math - apply$	$R M$ value in planar chromatography	$R M = log 10 ( 1 − R F R F ) = log 10 ( 1 R F − 1 )$
retention factor, $k$ in column chromatography	$Math - apply$	retardation factor, $R$ in column chromatography	$R = 1 k + 1$
		retention factor, $k$ in column chromatography	$k$
		retention factor, $k$ in column chromatography	$k = V R ' V M = t R ' t M$
		retention factor, $k$ in column chromatography	$k = amount of component in stationary phase amount of component in mobile phase$
		retention factor, $k$ in column chromatography	$k = 1 − R R$
		retention factor, $k$ in column chromatography	$κ = log 10 k = log 10 1 − R R$
retention index, $I$ in column chromatography	$Math - math$	retention index, $I$ in column chromatography	$I$
		retention index, $I$ in column chromatography	$I = 100 log 10 X i − log 10 X z log 10 X z + 1 − log 10 X z + z$
$R M$ value in planar chromatography	$Math - math$	$R M$ value in planar chromatography	$R M$
		$R M$ value in planar chromatography	$R M = log 10 ( 1 − R F R F ) = log 10 ( 1 R F − 1 )$
rotational correlation time, $τ c$ or $θ$	$Math - math$	residual emission anisotropy	$τ c$
		residual emission anisotropy	$r t = ( r 0 − r ∞ ) exp ( − t τ c ) + r ∞$
		rotational correlation time, $τ c$ or $θ$	$r t = r 0 exp ( − t τ c )$
		rotational correlation time, $τ c$ or $θ$	$τ c = 1 6 D r$
		rotational relaxation time, $ρ$	$ρ = 3 τ c$
	$Math - math$	residual emission anisotropy	$θ$
rotational frequency, $f rot$ in centrifugation	$Math - math$	rotational frequency, $f rot$ in centrifugation	$f rot$
		rotational frequency, $f rot$ in centrifugation	$f rot = d N d t$
rotational relaxation time, $ρ$	$Math - math$	rotational relaxation time, $ρ$	$ρ$
		rotational relaxation time, $ρ$	$ρ = 3 τ c$
		rotational relaxation time, $ρ$	$ρ = 1 / 6 D r$
rotational term, $F$	$Math - math$	rotational term, $F$	$F$