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quantitysymbolreferenced inequation
radiance, LMath - applyfluence rate, E oE o = ∫ 4 π L ⁢ d Ω
fluence rate, E oL
irradiance (at a point of a surface), EL cos ⁡ θ d Ω
irradiance (at a point of a surface), EL
irradiance (at a point of a surface), EE = ∫ 2 π L cos ⁡ θ ⁢ d Ω
radiance, LL = d 2 P d Ω d S ⊥ = d 2 P d Ω d S cos ⁡ θ
radiance, LL = ∫ λ L λ ⁢ d λ
radiant energy, Q Math - applyphoton 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, HH = d Q / d S = ∫ t E ⁢ d t
radiant exposure, HH = Q / S
radiant power, PP = d Q / d t
radiant power, PP = Q / t
radiant energy density, ρ, w Math - mathradiant energy density, ρ, w ρ
Math - mathradiant energy density, ρ, w w
radiant (energy) flux, P, ΦMath - mathradiant (energy) flux, P, ΦP
Math - mathradiant (energy) flux, P, ΦΦ
radiant exitance, MMath - mathradiant exitance, MM
radiant exitance, MM = d P / d S
radiant exitance, MM = P / S
radiant exitance, MM = ∫ λ M λ ⁢ d λ
radiant exposure, HMath - mathradiant exposure, HH
radiant exposure, HH = d Q / d S = ∫ t E ⁢ d t
radiant exposure, HH = Q / S
radiant exposure, HH = E t
radiant intensity, IMath - mathradiant intensity, II
radiant intensity, II = d P / d Ω
radiant intensity, II = P / Ω
radiant intensity, II = ∫ λ I λ ⁢ d λ
radiant power, PMath - mathfluence rate, E oP
fluence rate, E oE o = d P d S = d H o d t
fluence rate, E oE o = P S
irradiance (at a point of a surface), EP
irradiance (at a point of a surface), EE = d P d S
irradiance (at a point of a surface), EE = P S
radiance, LL = d 2 P d Ω d S ⊥ = d 2 P d Ω d S cos ⁡ θ
radiance, Ld P / ( d S cos ⁡ θ )
radiance, LP / S cos ⁡ θ
radiant energy, Q Q = P t
radiant exitance, MM = d P / d S
radiant exitance, MM = P / S
radiant intensity, II = d P / d Ω
radiant intensity, II = P / Ω
radiant power, PP
radiant power, PP = d Q / d t
radiant power, PP = Q / t
radiative lifetime, τ 0Math - mathradiative lifetime, τ 0τ 0
rate of conversion, ξ . Math - mathrate 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, vξ . = d ξ d t
rate of reaction, vξ . = − 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 - mathrate of reaction, vξ
rate of fluid consumption, q V in flame emission and absorption spectrometryMath - mathrate of fluid consumption, q V in flame emission and absorption spectrometryq V
rate of reaction, vMath - mathrate of reaction, vv
rate of reaction, vv = − 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 - mathreactance, X X
reaction cross-section, σ r Math - mathreaction cross-section, σ r σ r
reaction cross-section, σ r σ r = P r π b max 2
reduced mass, μ Math - mathreduced mass, μ μ
reflectance, ρMath - mathreflectance, ρρ
reflectance, ρρ λ = P λ refl P λ 0
reflectance, ρρ λ = ( n 1 − n 2 ) 2 ( n 1 + n 2 ) 2
refractive index, nMath - mathmolar refraction, R n
molar refraction, R R = V m n 2 − 1 n 2 + 2
relative atomic mass (atomic weight), A r Math - mathrelative atomic mass (atomic weight), A r A r
relative density, d Math - mathrelative density, d d
relative molecular mass, M r Math - msubosmotic pressure, Π Π = c B R T = ρ B R T M B
osmotic pressure, Π M B
Math - mathrelative molecular mass, M r M r
relative permeability, μ r Math - mathrelative permeability, μ r μ r
relative permittivity, ɛ r Math - mathDrude–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 transferw D +• A −• J = z D +• z A −• e 2 4 π ɛ 0 ɛ r a
Gibbs energy of photoinduced electron transferw DA J = z D z A e 2 4 π ɛ 0 ɛ r a
Gibbs energy of photoinduced electron transferɛ r
Gibbs energy of photoinduced electron transferw D +• A −• = N A μ 2 4 π ɛ 0 ρ 3 ɛ r − 1 2 ɛ r + 1
Gibbs energy of photoinduced electron transferΔ 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 chromatographyMath - mathrelative retardation, R rel in planar chromatographyR rel
relative retardation, R rel in planar chromatographyR rel = R F i R F st = b i b st
relative retardation, R rel in planar chromatographyR rel
relative retention, r in column chromatographyMath - mathrelative retention, r in column chromatographyr
relative retention, r in column chromatographyr = 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 biotechnologyMath - mathresidence time (hydraulic retention time), t r in biotechnologyt r
residual emission anisotropyMath - mathresidual emission anisotropyr ∞
residual emission anisotropyr t = ( r 0 − r ∞ ) exp ( − t τ c ) + r ∞
resistance, R Math - mathresistance, R R
resistivity, ρ Math - mathresistivity, ρ ρ
resolving power, R in optical spectroscopyMath - mathresolving power, R in optical spectroscopyR
response time, τ R of a detectorMath - mathresponse time, τ R of a detectorτ R
Math - mathresponse time, τ R of a detectorτ R
responsivity, R in detection of radiationMath - mathresponsivity, R in detection of radiationR
retardation factor, R in column chromatographyMath - mathretardation factor, R in column chromatographyR
retardation factor, R in column chromatographyR = 1 k + 1
retention factor, k in column chromatographyκ = log 10 k = log 10 1 − R R
retardation factor, R F in planar chromatographyMath - mathretardation factor, R F in planar chromatographyR F
retardation factor, R F in planar chromatographyR F = b a
Math - mathretardation factor, R F in planar chromatographyh R F
Math - apply R M value in planar chromatographyR M = log 10 ( 1 − R F R F ) = log 10 ( 1 R F − 1 )
retention factor, k in column chromatographyMath - applyretardation factor, R in column chromatographyR = 1 k + 1
retention factor, k in column chromatographyk
retention factor, k in column chromatographyk = V R ' V M = t R ' t M
retention factor, k in column chromatographyk = amount of component in stationary phase amount of component in mobile phase
retention factor, k in column chromatographyk = 1 − R R
retention factor, k in column chromatographyκ = log 10 k = log 10 1 − R R
retention index, I in column chromatographyMath - mathretention index, I in column chromatographyI
retention index, I in column chromatographyI = 100 log 10 X i − log 10 X z log 10 X z + 1 − log 10 X z + z
R M value in planar chromatographyMath - math R M value in planar chromatographyR M
R M value in planar chromatographyR M = log 10 ( 1 − R F R F ) = log 10 ( 1 R F − 1 )
rotational correlation time, τ c or θMath - mathresidual emission anisotropyτ c
residual emission anisotropyr t = ( r 0 − r ∞ ) exp ( − t τ c ) + r ∞
rotational correlation time, τ c or θr t = r 0 exp ( − t τ c )
rotational correlation time, τ c or θτ c = 1 6 D r
rotational relaxation time, ρρ = 3 τ c
Math - mathresidual emission anisotropyθ
rotational frequency, f rot in centrifugationMath - mathrotational frequency, f rot in centrifugationf rot
rotational frequency, f rot in centrifugationf rot = d N d t
rotational relaxation time, ρMath - mathrotational relaxation time, ρρ
rotational relaxation time, ρρ = 3 τ c
rotational relaxation time, ρρ = 1 / 6 D r
rotational term, F Math - mathrotational term, F F