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# Physics Formulas

### (SOME) FORMULAS

Description | Formula / Other |
---|---|

PART 1 | SI BASIC UNITS |

Length | Metre (m) |

Mass | Kilogram (kg) |

Time | Second (s) |

Electric Current | Ampere (A) |

Amount of Substance | Mole (mol) |

Temperature (absolute) | Kelvin (K) |

Luminous intensity | Candela (cd) |

PART 2 | SI DERIVED UNITS |

Area | Square Metre (m^2) |

Volume | Cubic Metre (m^3) |

Density | Kilogram per Cubic Metre (kg m^(-3)) |

Velocity | Metre per Second (m s^(-1)) |

Force | Newton (N) or (kg m s^(-2)) |

Energy | Joule (J) or (N m) |

Power | Watt (W) or (J s^(-1)) |

Charge | Coulomb (C) or (A s) |

Potential difference | Volt (V) or (J C^(-1)) |

Electric field | Volt per Metre (V m^1) |

Electric resistance | Ohm (Ω) or (V A^(-1)) |

Capacitance | Farad (F) or (C V^(-1)) |

Magnetic field | Tesla (T) or (Wb m^(-2)) |

Illumination | Lux (lx) or (lm m^(-2)) |

PART 3 | PREFIXES |

Giga- | G (10^9) |

Mega- | M (10^6) |

Kilo- | k (10^3) |

Centi- | c (10^(-2)) |

Milli- | m (10^(-3)) |

Micro- | μ (10^(-6)) |

Nano- | n (10^(-9)) |

PART 4 | PHYSICAL CONSTANTS |

Acceleration due to Gravity (on Earth) | g = [9.8 m s^(-2)] or [9.8 N kg-1] |

Equatorial radius of the Earth | 6.4 × 10^6 m |

Speed of Light (in vacuum) | c = 3.00 × 10^8 m s^(-1) |

Charge on Electron | e = 1.60 × 10^(-19) C |

Proton mass | 1.67 × 10^(−27) kg |

Neutron mass | 1.67 × 10^(−27) kg |

Electron mass | 9.11 × 10^(−31) kg |

Avogadro's number | 6.02 × 10^(23) mol^(−1) |

Planck's constant | h = 6.626 × 10^(-34) J s OR 4.136 × 10^(-15) eV s |

Gravitational constant | G = 6.67 × 10^(-11) N m^2 kg^(-2) |

Speed of Sound (dry air) | 640 m s^(-1) (20 oC) |

Mass of the Earth | 6.0 × 10^24 kg |

Mass of the Sun | 2.0 × 10^30 kg |

Mass of the Moon | 7.3 × 10^22 kg |

PART 5 | GREEK LETTERS |

α | Alpha (alpha particle radiation) |

β | Beta (beta particle radiation) |

γ | Gamma (gamma radiation) |

Δ (upper case) | Delta ("a change in" a quantity) |

ε | Epsilon (electromotive force (EMF); electrical permittivity) |

Φ | Phi (magnetic flux) |

λ | Lambda (wavelength) |

μ | Mu (micro; magnetic permeability) |

ν | Nu (frequency) |

π | Pi (used in circular functions: the ratio of a circle's circumference to its diameter) |

θ | Theta (angles) |

ρ | Rho (resistivity) |

σ | Sigma (stress) |

τ | Tau (torque) |

ω (lower case) | Omega (angular velocity) |

Ω (upper case) | Omega (electrical resistance) |