CHAPTERS BY WACEK KIJEWSKI
# Chapter 14 Physical Constants
π = 3.14159
e = 2.71828
1 radian ==57.2958 degrees
acceleration due to gravity in Cape Town 
= 9.7966 m/s² 
acceleration due to gravity in Gaborone 
= 9.7860 m/s² 
acceleration due to gravity on Equator 
= 9.7803 m/s² 
acceleration due to gravity in Budapest 
= 9.8085 m/s² 
acceleration due to gravity in London 
= 9.8118 m/s² 
acceleration due to gravity in North Pole 
= 9.8322 m/s² 
acceleration due to gravity on the Moon 
= 1.66 m/s² 
gravitational constant (G) 
= 6.672 × 10^{11 }N m^{2 }kg^{2} 


speed of sound in air 
= 330 – 333 m/s 
speed of sound in water 
= 1500 m/s 
speed of sound in steel 
= 5000 m/s 
speed of light in a vacuum (c) 
= 2.99793 × 10^{8 }m/s 


standard volume of an ideal gas 
= 22.41 dm^{3} 
Avogadro's constant 
= 6.022 × 10^{23} mol^{1} 
proton rest mass 
= 1.673 × 10^{27} kg 
electron rest mass 
= 9.110 × 10^{31} kg 
charge on a proton or electron (±e) 
= ± 1.602 × 10^{19} C 


charge of 1C 
= 6.241 × 10^{18} electrons 
charge/mass ratio for an electron (e/m) 
= 1.759 × 10^{11} C kg^{1} 
Planck's constant (h) 
= 6.626 × 10^{34 }J s 
radius of electron 
= 2.818 × 10^{15} m 
α particle, mass 
= 6.645 × 10^{27} kg 
radius of hydrogen atom 
= 5.292 × 10^{11} m 
temperature of absolute zero 
= 273.16 °C 
Do you like anecdotes, interesting and challenging problems, fun facts, puzzles, jokes related to metric system and measurement? Read them in the 2006 online edition of "SI Units, Conversion and Measurement Skills",186 pp.