radiation density unit
data derived with UnitSystems.jl
\[\text{F}\cdot \text{L}^{-2}\Theta^{-4}\]
\[\left[\text{k}_\text{B}^{4}\hbar^{-3}\text{c}^{-3}\phi^{-3}\right]\]
\[a = 4\frac{\sigma}{c} = \frac{8\pi^5 k_B^4}{15h^3c^3} = \frac{\pi^2 k_B^4}{15\hbar^3c^3} = \frac{2^7\pi^5 h}{15c^7\alpha^8} \left(\frac{g_0R_uR_\infty}{\mu_{eu}M_u}\right)^4\]
| Quantity | Product | UnitSystem |
|---|---|---|
| $7.5657332399(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}$ | Metric |
| $7.565733250280007 \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\hbar^{-3}\text{c}^{-3}\tau^{5}2^{-2}3^{-1}5^{-1}$ | SI2019 |
| $7.5652141525(93) \times 10^{-16}$ $\left[\text{kg}\cdot \text{m}^{-1}\text{s}^{-2}\text{K}^{-4}\right]$ | $\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}4778.668917386054$ | SI1976 |
| $7.565723(17) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{R}_\text{K}^{-1}\text{K}_\text{J}^{-2}\text{R}_\text{u}^{4}\tau^{5}2^{16}3^{-1}5^{11}$ | CODATA |
| $7.5657317605(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}{\text{R}_\text{K}^{90}}^{-1}{\text{K}_\text{J}^{90}}^{-2}\tau^{5}2^{16}3^{-1}5^{11}$ | Conventional |
| $7.5644848940(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\Omega_\text{it}\cdot \text{V}_\text{it}^{-2}\tau^{5}2^{14}3^{-1}5^{11}$ | International |
| $7.5642958536(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}/1.0001900224889804$ | InternationalMean |
| $7.5657332399(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}$ | MetricTurn |
| $7.5657332399(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}$ | MetricSpatian |
| $7.5657332399(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}$ | MetricGradian |
| $7.5657332399(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}$ | MetricDegree |
| $7.5657332399(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}$ | MetricArcminute |
| $7.5657332399(93) \times 10^{-16}$ $\left[\text{J} \cdot \text{m}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{14}3^{-1}5^{11}$ | MetricArcsecond |
| $7.7149008478(95) \times 10^{-17}$ $\left[\text{kgf}\cdot \text{m}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0^{-1}\tau^{5}2^{14}3^{-1}5^{11}$ | Engineering |
| $7.7149008478(95) \times 10^{-17}$ $\left[\text{kgf}\cdot \text{m}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0^{-1}\tau^{5}2^{14}3^{-1}5^{11}$ | Gravitational |
| $7.5657332399(93) \times 10^{-19}$ $\left[\text{t}\cdot \text{m}^{-1}\text{s}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{11}3^{-1}5^{8}$ | MTS |
| $7.5657332399(93) \times 10^{-15}$ $\left[\text{Ba} \cdot \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{15}3^{-1}5^{12}$ | EMU |
| $7.5657332399(93) \times 10^{-15}$ $\left[\text{Ba} \cdot \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{15}3^{-1}5^{12}$ | ESU |
| $7.5657332399(93) \times 10^{-15}$ $\left[\text{Ba} \cdot \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{15}3^{-1}5^{12}$ | Gauss |
| $7.5657332399(93) \times 10^{-15}$ $\left[\text{Ba} \cdot \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{15}3^{-1}5^{12}$ | LorentzHeaviside |
| $4.8429526857(60) \times 10^{-17}$ $\left[\text{lb}\cdot \text{ft}^{-1}\text{s}^{-2}{^\circ}\text{R}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{ft}\cdot \text{lb}^{-1}\tau^{5}2^{14}3^{-9}5^{15}$ | FPS |
| $1.0453025771(13) \times 10^{-20}$ $\left[\text{lb}\cdot \text{in}^{-2}{^\circ}\text{R}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0^{-1}\text{ft}^{2}\text{lb}^{-1}\tau^{5}2^{10}3^{-11}5^{15}$ | IPS |
| $1.5052357111(19) \times 10^{-18}$ $\left[\text{lb}\cdot \text{ft}^{-2}{^\circ}\text{R}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0^{-1}\text{ft}^{2}\text{lb}^{-1}\tau^{5}2^{14}3^{-9}5^{15}$ | British |
| $1.5052357111(19) \times 10^{-18}$ $\left[\text{lbf}\cdot \text{ft}^{-2}{^\circ}\text{R}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0^{-1}\text{ft}^{2}\text{lb}^{-1}\tau^{5}2^{14}3^{-9}5^{15}$ | English |
| $1.5052417320(19) \times 10^{-18}$ $\left[\text{lbf}\cdot \text{ft}^{-2}{^\circ}\text{R}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0^{-1}\text{ft}_\text{US}^{2}\text{lb}^{-1}\tau^{5}2^{14}3^{-9}5^{15}$ | Survey |
| $3.3139744074(41) \times 10^{-6}$ $\left[\text{lb}\cdot \text{mi}^{-1}\text{h}^{-2}{^\circ}\text{R}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{ft}\cdot \text{lb}^{-1}\tau^{5}2^{27}3^{-4}5^{20}11$ | MPH |
| $9.805190279(12) \times 10^{-6}$ $\left[\text{kg}\cdot \text{km}^{-1}\text{h}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\tau^{5}2^{25}3^{3}5^{18}$ | KKH |
| $1.8105286934(43) \times 10^{-5}$ $\left[\text{keg}\cdot \text{nm}^{-1}\text{h}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0\cdot \text{GM}_\text{E}^{-1}\tau^{3}2^{44}5^{34}$ | Nautical |
| $7.543869556(18) \times 10^{-16}$ $\left[\text{eJ} \cdot \text{em}^{-3} \text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar\cdot \text{c}^{-7}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{g}_0\cdot \text{GM}_\text{E}^{-1}\tau^{3}2^{32}3^{-1}5^{25}$ | Meridian |
| $4.249112(94) \times 10^{-25}$ $\left[\text{M}_\odot\cdot \text{au}^{-1}\text{D}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar^{2}\text{c}^{-6}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{au}^{-2}\text{k}_\text{G}^{-2}\text{m}_\text{P}^{-2}\tau^{2}2^{56}3^{19}5^{25}$ | IAU☉ |
| $3.635204(80) \times 10^{-22}$ $\left[\text{ME}\cdot \text{LD}^{-1}\text{D}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar^{2}\text{c}^{-6}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{m}_\text{P}^{-2}\text{GM}_\text{E}^{-1}\tau^{4}2^{31}3^{8}5^{18}14236.999999999998$ | IAUE |
| $2.316332(51) \times 10^{-21}$ $\left[\text{MJ}\cdot \text{JD}^{-1}\text{D}^{-2}\text{K}^{-4}\right]$ | $\text{k}_\text{B}^{4}\text{N}_\text{A}^{4}\hbar^{2}\text{c}^{-6}\text{R}_{\infty}^{4}\alpha^{-8}\mu_\text{eu}^{-4}\text{m}_\text{P}^{-2}\text{GM}_\text{J}^{-1}\tau^{4}2^{34}3^{6}5^{21}259492.99999999997$ | IAUJ |
| $2.920(54) \times 10^{115}$ $\left[\text{T}^{-3}\right]$ | $\text{c}^{3}\text{R}_{\infty}^{3}\alpha^{-6}\text{H}_0^{-3}\text{au}^{3}\tau^{2}2^{31}3^{11}5^{17}$ | Hubble |
| $\infty $ $\left[\text{M}^{-3}\text{T}^{-3}\right]$ | $\hbar^{-6}\text{c}^{12}\Omega_{\Lambda}^{-3}\text{H}_0^{-6}\text{au}^{6}\text{m}_\text{P}^{6}\tau^{2}2^{58}3^{20}5^{35}$ | Cosmological |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | CosmologicalQuantum |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | Planck |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | PlanckGauss |
| $2.5568454345(12) \times 10^{-7}$ $\left[\text{M}^{-3}\text{T}^{-3}\right]$ | $\alpha^{3}\tau^{2}2^{-2}3^{-1}5^{-1}$ | Stoney |
| $2.5568454345(12) \times 10^{-7}$ $\left[\text{a}_0^{3}\right]$ | $\alpha^{3}\tau^{2}2^{-2}3^{-1}5^{-1}$ | Hartree |
| $3.1960567932(15) \times 10^{-8}$ $\left[\text{M}\cdot \text{L}^{-1}\text{T}^{2}\right]$ | $\alpha^{3}\tau^{2}2^{-5}3^{-1}5^{-1}$ | Rydberg |
| $2.5568454345(12) \times 10^{-7}$ $\left[\text{M}\cdot \text{L}^{-1}\text{T}^{2}\right]$ | $\alpha^{3}\tau^{2}2^{-2}3^{-1}5^{-1}$ | Schrodinger |
| $2.5568454345(12) \times 10^{-7}$ $\left[\text{T}^{-3}\right]$ | $\alpha^{3}\tau^{2}2^{-2}3^{-1}5^{-1}$ | Electronic |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | Natural |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | NaturalGauss |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | QCD |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | QCDGauss |
| $0.6579736267392905$ $\left[\mathbb{1}\right]$ | $\tau^{2}2^{-2}3^{-1}5^{-1}$ | QCDoriginal |