Source code for aerosandbox.tools.units

from math import pi

# Lengths (equivalents in meters)

[docs]meter = 1


[docs]inch = 0.0254



[docs]yard = 3 * foot


[docs]mile = 5280 * foot


[docs]naut_mile = 1852


# Masses (equivalents in kilograms)

[docs]kg = 1


[docs]gram = 0.001


[docs]slug = 14.59390


[docs]lbm = 0.45359237


[docs]pound = lbm


[docs]short_ton = 2000 * lbm


[docs]long_ton = 2240 * lbm


[docs]oz = lbm / 16


# Time (equivalents in seconds)

[docs]second = 1


[docs]minute = 60


[docs]hour = 60 * minute


[docs]day = 24 * hour


[docs]week = 7 * day


[docs]year = 365.2425 * day


[docs]month = year / 12


# Force (equivalents in Newtons)

[docs]newton = 1


[docs]lbf = slug * foot


[docs]pound_force = lbf


# Speed (equivalents in m/s)

[docs]kph = 1000 * meter / hour


[docs]knot = 1.852 * kph


[docs]mph = mile / hour


[docs]fps = foot / second


# Rotational Speed (equivalents in radians/second)

[docs]rads_per_sec = 1


[docs]rps = 2 * pi


[docs]rpm = rps / 60


# Volume (equivalents in m^3)

[docs]liter = 0.001


[docs]gallon_us = 231 * inch ** 3


[docs]gallon_imperial = 4.54609 * liter


[docs]gallon = gallon_us


[docs]quart = gallon_us / 4


# Pressure (equivalents in Pa)

[docs]pascal = 1


[docs]atm = 101325


[docs]torr = atm / 760


[docs]psi = lbf / inch ** 2


[docs]psf = lbf / foot ** 2


# Power (equivalents in Watts)

[docs]watt = 1


[docs]horsepower = 550 * foot * lbf / second


[docs]hp = horsepower


# Current (equivalents in Amperes)

[docs]amp = 1


# Energy (equivalents in Joules)

[docs]joule = 1


[docs]btu = 1055.05585262


[docs]calorie = 4.184


[docs]kcal = 1000 * calorie


[docs]watt_hour = watt * hour


# SI prefixes

[docs]yocto = 1e-24


[docs]zepto = 1e-21


[docs]atto = 1e-18


[docs]femto = 1e-15


[docs]pico = 1e-12


[docs]nano = 1e-9


[docs]micro = 1e-6


[docs]milli = 1e-3


[docs]centi = 1e-2


[docs]deci = 1e-1


[docs]deka = 1e1


[docs]hecto = 1e2


[docs]kilo = 1e3


[docs]mega = 1e6


[docs]giga = 1e9


[docs]tera = 1e12


[docs]peta = 1e15


[docs]exa = 1e18


[docs]zetta = 1e21


[docs]yotta = 1e24


# Some abbreviations / alternate names

[docs]m = meter


[docs]ft = foot


[docs]yd = yard


[docs]mi = mile


[docs]nmi = naut_mile


[docs]kilogram = kg


[docs]sec = second


[docs]s = second


[docs]min = minute


[docs]hr = hour


[docs]wk = week


[docs]yr = year


[docs]N = newton


[docs]kt = knot


[docs]L = liter


[docs]Pa = pascal