:math:`10^{-1}` ``centi`` :math:`10^{-2}` ``milli`` :math:`10^{-3}` ``micro`` :math:`10^{-6}` ``nano`` :math:`10^{-9}` ``pico`` :math:`10^{-12}` ``femto`` :math:`10^{-15}` ``atto`` :math:`10^{-18}` ``zepto`` :math:`10^{-21}` ``yocto`` :math:`10^{-24}` ``ronto`` :math:`10^{-27}` ``quecto`` :math:`10^{-30}` ============ ================================================================= Binary prefixes --------------- ============ ================================================================= ``kibi`` :math:`2^{10}` ``mebi`` :math:`2^{20}` ``gibi`` :math:`2^{30}` ``tebi`` :math:`2^{40}` ``pebi`` :math:`2^{50}` ``exbi`` :math:`2^{60}` ``zebi`` :math:`2^{70}` ``yobi`` :math:`2^{80}` ============ ================================================================= Mass ---- ================= ============================================================ ``gram`` :math:`10^{-3}` kg ``metric_ton`` :math:`10^{3}` kg ``grain`` one grain in kg ``lb`` one pound (avoirdupous) in kg ``pound`` one pound (avoirdupous) in kg ``blob`` one inch version of a slug in kg (added in 1.0.0) ``slinch`` one inch version of a slug in kg (added in 1.0.0) ``slug`` one slug in kg (added in 1.0.0) ``oz`` one ounce in kg ``ounce`` one ounce in kg ``stone`` one stone in kg ``grain`` one grain in kg ``long_ton`` one long ton in kg ``short_ton`` one short ton in kg ``troy_ounce`` one Troy ounce in kg ``troy_pound`` one Troy pound in kg ``carat`` one carat in kg ``m_u`` atomic mass constant (in kg) ``u`` atomic mass constant (in kg) ``atomic_mass`` atomic mass constant (in kg) ================= ============================================================ Angle ----- ================= ============================================================ ``degree`` degree in radians ``arcmin`` arc minute in radians ``arcminute`` arc minute in radians ``arcsec`` arc second in radians ``arcsecond`` arc second in radians ================= ============================================================ Time ---- ================= ============================================================ ``minute`` one minute in seconds ``hour`` one hour in seconds ``day`` one day in seconds ``week`` one week in seconds ``year`` one year (365 days) in seconds ``Julian_year`` one Julian year (365.25 days) in seconds ================= ============================================================ Length ------ ===================== ============================================================ ``inch`` one inch in meters ``foot`` one foot in meters ``yard`` one yard in meters ``mile`` one mile in meters ``mil`` one mil in meters ``pt`` one point in meters ``point`` one point in meters ``survey_foot`` one survey foot in meters ``survey_mile`` one survey mile in meters ``nautical_mile`` one nautical mile in meters ``fermi`` one Fermi in meters ``angstrom`` one Angstrom in meters ``micron`` one micron in meters ``au`` one astronomical unit in meters ``astronomical_unit`` one astronomical unit in meters ``light_year`` one light year in meters ``parsec`` one parsec in meters ===================== ============================================================ Pressure -------- ================= ============================================================ ``atm`` standard atmosphere in pascals ``atmosphere`` standard atmosphere in pascals ``bar`` one bar in pascals ``torr`` one torr (mmHg) in pascals ``mmHg`` one torr (mmHg) in pascals ``psi`` one psi in pascals ================= ============================================================ Area ---- ================= ============================================================ ``hectare`` one hectare in square meters ``acre`` one acre in square meters ================= ============================================================ Volume ------ =================== ======================================================== ``liter`` one liter in cubic meters ``litre`` one liter in cubic meters ``gallon`` one gallon (US) in cubic meters ``gallon_US`` one gallon (US) in cubic meters ``gallon_imp`` one gallon (UK) in cubic meters ``fluid_ounce`` one fluid ounce (US) in cubic meters ``fluid_ounce_US`` one fluid ounce (US) in cubic meters ``fluid_ounce_imp`` one fluid ounce (UK) in cubic meters ``bbl`` one barrel in cubic meters ``barrel`` one barrel in cubic meters =================== ======================================================== Speed ----- ================== ========================================================== ``kmh`` kilometers per hour in meters per second ``mph`` miles per hour in meters per second ``mach`` one Mach (approx., at 15 C, 1 atm) in meters per second ``speed_of_sound`` one Mach (approx., at 15 C, 1 atm) in meters per second ``knot`` one knot in meters per second ================== ========================================================== Temperature ----------- ===================== ======================================================= ``zero_Celsius`` zero of Celsius scale in Kelvin ``degree_Fahrenheit`` one Fahrenheit (only differences) in Kelvins ===================== ======================================================= .. autosummary:: :toctree: generated/ convert_temperature Energy ------ ==================== ======================================================= ``eV`` one electron volt in Joules ``electron_volt`` one electron volt in Joules ``calorie`` one calorie (thermochemical) in Joules ``calorie_th`` one calorie (thermochemical) in Joules ``calorie_IT`` one calorie (International Steam Table calorie, 1956) in Joules ``erg`` one erg in Joules ``Btu`` one British thermal unit (International Steam Table) in Joules ``Btu_IT`` one British thermal unit (International Steam Table) in Joules ``Btu_th`` one British thermal unit (thermochemical) in Joules ``ton_TNT`` one ton of TNT in Joules ==================== ======================================================= Power ----- ==================== ======================================================= ``hp`` one horsepower in watts ``horsepower`` one horsepower in watts ==================== ======================================================= Force ----- ==================== ======================================================= ``dyn`` one dyne in newtons ``dyne`` one dyne in newtons ``lbf`` one pound force in newtons ``pound_force`` one pound force in newtons ``kgf`` one kilogram force in newtons ``kilogram_force`` one kilogram force in newtons ==================== ======================================================= Optics ------ .. autosummary:: :toctree: generated/ lambda2nu nu2lambda References ========== .. [CODATA2018] CODATA Recommended Values of the Fundamental Physical Constants 2018. https://physics.nist.gov/cuu/Constants/ é