Learn Chemistry with Prof. Kiran Patil

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 Units & Dimensions  Some Important Physical Constants • Velocity of light in vacuum (c) = 3 × 108 ms-1 • Velocity of sound in air at STP = 331 ms-1 • Acceleration due to gravity (g) = 9.81 ms-2 • Avogadro number (N) = 6.023 × 1023/mol • Density of water at 4oC = 1000 kgm-3 or 1 g/cc. • Absolute zero = -273.15oC or 0 K • Atomic mass unit = 1.66 × 10-27 kg • Quantum of charge (e) = 1.602 × 10-19 C • Stefan’s constant = 5.67 × 10–8 W/m2/K4 • Boltzmann’s constant (K) = 1.381 × 10-23  • JK-1One atmosphere = 76 cm • Hg = 1.013 × 105 Pa • Mechanical equivalent of heat (J) = 4.186 J/cal • Planck’s constant (h) = 6.626 × 10-34 Js • Universal gas constant (R) = 8.314 J/mol–K • Permeability of free space (μ0) = 4π × 10-7 Hm-1 • Permittivity of free space (ε0) = 8.854 × 10-12 Fm-1 • The density of air at S.T.P. = 1.293 kg m-3 • Universal gravitational constant = 6.67 × 10-11 Nm2kg-2