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