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# 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 m2 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 × 108 m/s

 

standard volume of an ideal gas

= 22.41 dm3

Avogadro's constant 

= 6.022 × 1023 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 × 1018 electrons

charge/mass ratio for an electron (-e/m)

= -1.759 × 1011 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 on-line edition of "SI Units, Conversion and Measurement Skills",186 pp.