Sponsored by the Institute of Physics   Constants   A to B   C to D   E to F   G to I   J to L   M   N to Q   R to T   U to Z Equations Periodic Table Conversions Java Structurer SI Units Symbols   Printer Version Science Constants - R to T Rr | Ss | Tt A to B | C to D | E to F | G to I | J to L | M | N to Q | R to T | U to Z Rr   Name Symbol Value   Radiation Constant, Second hc/k c2 1.4387752(25) × 10-2 m K   Radius, Bohr a0 5.291772083(19) × 10-11 m Radius, Earth's Average R 6.37 × 106 m   Radius, Sun's Mean 6.960 × 108 m   Ramanujan-Soldner Constant µ 1.4513692349    Refractive Index of Glass ng 1.50    Refractive Index of Paraffin np 1.42    Refractive Index of Water nw 1.33    Residual Entropy For Square Ice 1.5396007178    Resistance, Quantized Hall RH 25812.8056 Ω   Rydberg Constant α2mec/2h R∞ R∞c R∞hc 10973731.568549(83) m-1 3.289841960368(25) × 1015 Hz 2.17987190(17) × 10-18 J   Rydberg Number, Hydrogen RH 1.0967758 × 107 m-1   Rr | Ss | Tt To the top | To the bottom A to B | C to D | E to F | G to I | J to L | M | N to Q | R to T | U to Z Ss   Name Symbol Value   Sackur-Tetrode Constant S0/R -1.1517048(44)  -1.1648678(44)  Second Radiation Constant hc/k c2 1.4387752(25) × 10-2 m K   Self-Numbers Density Constant λ 0.252660259    Shapiro's Cyclic Sum Constant λ 0.4945668    Shielded Proton Gyromagnetic Ratio 2µp/ħ (H2O, sphere, 25°C) γ'p γ'p/2π 2.67515341(11) × 108 s-1 T-1 42.5763888(18) MHz T-1   Shielded Proton Magnetic Moment (H2O, sphere, 25°C) µ'p µ'p/µB µ'p/µN 1.410570399(59) × 10-26 J T-1 1.520993132(16) × 10-3  2.792775597(31)    Short Hundredweight (US) short cwt 4.535 × 104 g   Short Ton 9.071 × 105 g 2000 lb   Siegbahn Unit UX X 1.00020778970 × 10-13 m Sierpinski's Constant K 2.5849817596  Sigma σ 1 × 1012 m Siriometre 1.49597870 × 1015 m Siriusweit 1.5428387847 × 1017 m Slug 14.59390294 kg Solar Constant 1400 W m-2   Sound, Speed of (in Air at STP) v 340 m s-1   Specific Heat Capacity of Copper cc 385 J kg-1 K-1   Specific Heat Capacity of Water cw 4200 J kg-1 K-1   Specific Latent Heat of Fusion of Water 3.34 × 105 J kg-1   Specific Latent Heat of Vapourisation of Water 2.26 × 106 J kg-1   Spectral Radiance, First Radiation Constant for 2hc2 c1L 1.191042722(93) × 10-16 W m2 sr-1   Speed of Light in a Vacuum c 299792458 m s-1   Speed of Sound in Air at STP v 340 m s-1   Square Mile 2.589 × 106 m2 Square Root of 2 1.41421356237309504880    Square Root of 3 1.73205080756887729353    Square Yard yd2 0.8361 m2   Steel, Linear Expansivity of α 1.2 × 10-5 K-1   Steel, Young Modulus for Es 2.1 × 1011 Pa   Stefan-Boltzmann Constant (π2/60)k4/ħ3c2 σ 5.670400(40) × 10-8 W m-2 K-4   Sun's Energy Production 3.90 × 1026 W   Sun's Mass 1.99 × 1030 kg   Sun's Mean Distance From Earth 1.495 × 1011 m   Sun's Mean Radius 6.960 × 108 m   Rr | Ss | Tt To the top | To the bottom A to B | C to D | E to F | G to I | J to L | M | N to Q | R to T | U to Z Tt   Name Symbol Value   Tau Compton Wavelength λC,τ 0.69770(11) × 10-15 m Tau Mass mτ 3.16788(52) × 10-27 kg 1.90774(31) u   Tau Molar Mass NAmτ M(τ) Mτ 1.90774(31) × 10-3 kg mol-1   Tau-Electron Mass Ratio mτ/me 3.47760(57)    Tau-Muon Mass Ratio mτ/mµ 16.8188(27)    Tau-Neutron Mass Ratio mτ/mn 1.89135(31)    Tau-Proton Mass Ratio mτ/mp 1.89396(31)    Thermal Conductivity of Copper kc 385 W m-1 K-1   Thermal Conductivity of Glass kg 1.0 W m-1 K-1   Thomson Cross Section σe 0.665245854(15) × 10-28 m2   Time, Planck lP/c = (ħG/c5)1/2 tP 5.3906(40) × 10-44 s   Ton 106 kg   Ton, Short 9.071 × 105 g 2000 lb   Ton, UK, per 1000yd 1.111 kg m-1   Ton, UK, per Mile 0.6313 kg m-1   Troy Ounce oz 31.103 g   Rr | Ss | Tt To the top | To the bottom A to B | C to D | E to F | G to I | J to L | M | N to Q | R to T | U to Z   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] Download | Shop | Contact | About   Page compiled: Wed Sep 05 18:37:52 GMT+01:00 2001