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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  
           
  constant Radiation Constant, Second hc/k c2 1.438 7752 ± 0.000 025 × 10−2  m K  
           
  Radius, Earth's Mean Equatorial Radius, Earth's Mean Equitorial symbol for mean equitorial radius 6.378 140 × 106 m  
           
  Radius, Earth's Mean Radius, Earth's Mean   6.3710 × 106 m  
           
  Radius, Sun's Radius, Sun's   6.9599 × 108 m  
           
  Ramujan-Soldner Constant Ramanujan-Soldner Constant μ 1.451 369 2349  
           
  Rafractive Index of Glass Refractive Index of Glass   1.46008 at 546.1 nm, assuming fused silica, 100% SiO2  
           
  Refractive Index of water Refractive Index of Water nD 1.3328 at 589 nm and 20°C  
           
  Residual Entropy For Square Ice Residual Entropy For Square Ice   1.539 607 178  
           
    Resistance, Quantized Hall RH 25812.8056 Ω  
           
  Rydberg Constant alpha Rydberg Constant α2mec/2h R∞ 1.097 373 156 8549 ± 000 000 000 0083 × 107 m−1
 3.289 841 960 368 ± 000 000 000 025 × 10 15 Hz/c
2.179 871 90 ± 000 000 17× 10−18 J/ hc
 13.605 691 72 ± 000 000 000 53 eV/ hc
 
           
    Rydberg Number, Hydrogen RH 1.096 7758 × 107  m −1  
           
 
 
 
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  Ss  
    Name Symbol Value  
           
  Sackur-Tetrode Constant Sackur-Tetrode Constant S0R −1.151 7048 ± 0.000 0044  
        −1.164 8678 ± 0.000 0044  
           
    Sample  

0.333 333 333 drachm
20 grain
1.295 9782 × 10 −3 kg

 
           
  Second Radiation Constant hc/k Second Radiation Constant hc/k c2 1.438 7752 ± 0.000 0025 × 10−2 m K  
       
  Self-Numbers density Constant Self-Numbers Density Constant λ 0.252 660 259  
       
  Shapiro's Cyclic Sum Constant Shapiro's Cyclic Sum Constant λ

0.494 5668

  
           
    Shielded helion gyromagnetic ratio γ'k

2.037 894 764 ± 0.000 000 085 × 108 s−1 T−1

 
           
    Shielded helion magnetic moment γ'k

−1.074 552 967 ± 0.000 000 045 × 10−26JT−1

  
           
    Shielded helion to proton magnetic moment ratio μ′k/μp

−0.761 766 563 ± 0.000 000 012

  
           
    Shielded helion to shielded proton magnetic moment ratio μ′k/μ′p −0.761 786 1313 ± 0.000 000 0033  
       
  Shielded Proton Gyromagnetic Ratio Shielded Proton Gyromagnetic Ratio 2μ p /h (H2O, sphere, 25°C) γ'p 2.675 222 12 ± 0.000 000 11 × 108 s−1 T−1  
  γ'p/2π 42.576 3888 ± 0.000 0018 MHz T−1  
       
  Shielded Proton magnetic Moment Shielded Proton Magnetic Moment (H2O, sphere, 25°C) μ'p 1.410 570 399 ± 0.000 000 059 × 10−26  J T−1
  
  μ'p/μB 1.520 993 132 ± 0.000 000 016 × 10−3  
      μ'p/μN 2.792 775 597 ± 0.000 000 031  
       
  Short Hundredweight (US) Short Hundredweight (US) short 4.535 × 104  g  
      cwt  
       
  Short Ton Short Ton 9.071 × 105  g  
      2000 lb  
       
  Siegbahn Unit Siegbahn Unit
X-unit		 X.U. 1.002 02 × 10−13 m  
       
  Sierpinski's Constant Sierpinski's Constant K 2.584 981 7596  
       
    Sievert

Sv

   
           
  Sigma Sigma σ 1 × 1012 m  
       
  Siriometre Siriometre
Siriusweit

106 AU

 
       
  Slug or Gee pounds Slug
Gee pound

14.5939 kg
32.1740 lb

 
       
  Solar Constant Solar Constant 1373 W m −2  
       
    Sound, Speed of (in Air at STP) v 340 m s−1  
       
    Span  

9 in
0.2286 m

 
           
    Specific Heat Capacity of Copper cc 385 J kg−1  K−1
  
       
    Specific Heat Capacity of Water  

4.1818 × 103 J kg−1 K−1 at 20°C

  
       
    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 2hc Spectral Radiance, First Radiation Constant for 2hc2 c1L 1.191 042 722 ± 0.000 000 093 × 10−16  W m2  sr−1  
       
    Speed of Light in a Vacuum c

299 792 458 m s−1

 
       
    Speed of Sound in Air at STP  

343.4 m s−1 at standard atmospheric pressure and 20°C

 
       
  Square Mile Square Mile 2.589 × 106  m2
 
       
  Square Root of 2 Square Root of 2 1.414 213 562 373 095 048 80  
       
  Square Root of 3 Square Root of 3 1.732 050 807 568 877 293 53  
       
  Square Yard Square Yard yd2 0.8361 m2  
       
    Standard acceleration of gravity

gn

9.806 65 m s−2

 
           
    Steel, Linear Expansivity of α 1.2 × 10−5  K−1  
       
    Steel, Young Modulus for Es 2.1 × 1011 Pa  
       
  Stefan-Boltzmann Constant Stefan-Boltzmann constant σ 5.670 400 ± 0.000 040 × 10−8  W m−2  K−4  
       
    Stone  

14 lb
6.350 293 18 kg

 
           
  Sun's Energy Production Sun's Energy Production 3.90 × 1026  W  
       
  Sun's Mass Sun's Mass 1.99 × 1030  kg  
       
  Sun's Mean Distance From Earth Sun's Mean Distance From Earth 1.495 × 1011  m  
       
  Sun's Mean Radius Sun's Mean Radius   6.960 × 108  m  
           
    Surface area of the Earth  

5.10 × 1014 m2

 
           
    Surface area of the Sun   6.087 × 1018 m2  
 
 
 
Rr |  Ss | Tt
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  Tt  
    Name Symbol Value  
           
    Tablespoon   2 dessert spoon
4 teaspoon
about 14.5 × 10−6 m3 (14.5 mL) 		 
           
  Tau value Tau Compton Wavelength λC,τ 0.697 70 ± 0.000 11 × 10−15 m  
           
  tau value Tau Mass mτ

3.167 88 ± 0.000 52 × 10−27 kg
1.907 774 ± 0.000 031 u
2.847 15 ± 0.000 46 × 10 −10 J/ c2
1777.05 ± 0.29 MeV/ c2

 
           
  Tau Molar Mass N Tau Molar Mass NAmt M(t) 1.907 74 ± 0.000 31 × 10−3 kg mol−1  
      Mt    
       
 
  Tau-Electron Mass Ratio Tau-Electron Mass Ratio mt/me 3477.60 ± 0.57  
           
  Tau-Muon Mass Ratio Tau-Muon Mass Ratio mτ/mμ 16.8188 ± 0.0027  
           
  Tau-Neutron Mass Ratio Tau-Neutron Mass Ratio mτ/mn 1.891 35 ± 0.000 31
  
           
  Tau-Proton Mass Ratio Tau-Proton Mass Ratio mτ/mp 1.893 96 ± 0.000 31
  
           
    Teaspoon   3.12 × 10−6 m3 (3.12 mL)
0.5 dessert spoon
0.25 tablespoon 		 
           
   

The Golden mean
The Golden ratio

φ

1.618 033 988.

 
           
    Thermal Conductivity of Copper kc 385 W m−1 K−1  
           
    Thermal Conductivity of Glass k

1.3 W m−1 K−1 at 0°C assuming vitreous silica, 100% SiO2

 
           
  Thomson Cross Section Thomson Cross Section σe 6.652 458 54 ± 0.000 000 15 × 10−29  m2  
           
  Time, Planck Time, Planck lP/c = (ħG/c5)1/2 TP 5.3906 ± 0.0040 × 10−44  s
 
           
  Ton Ton   106 kg  
           
  Ton, Short Ton, Short   9.071 × 105  g  
        2000 lb  
           
  Ton (of TNT) Ton (of TNT)  

4.18 × 109 J

 
         
  Ton (UK)

Ton (UK)

 

2240 lb
1.016 047 × 103 kg

 
         
    Tonne

t

1000 kg

 
           
   

Torr

Torr

1.333 22 × 102 Pa
1 mm Hg 		 
           
    Total radiant power of the Sun   3.86 × 1026 W  
           
    Tropical year a , atrop 365.242 198 78 d, in the year 1900, decreasing at 6.14 × 10−6 d per century.  
           
  Troy Ounce or Apotjecaries Ounce

Troy ounce
Apothecaries' ounce

oz apoth
oz ap

20 pennyweight
8 drachm
3.110 347 68 × 10−2 kg

 
           
  Troy Pound Troy pound  

12 troy ounce
0.373 241 7216 kg

 
           
 
 
 
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