SciPy Constants

As SciPy is more focused on scientific implementations, it provides many built-in scientific constants

Constants in SciPy

As SciPy is more focused on scientific implementations, it provides many built-in scientific constants.

These constants can be helpful when you are working with Data Science.

PI is an example of a scientific constant.

Example

Print the constant value of PI:

from scipy import constants

print(constants.pi)

Constant Units

A list of all units under the constants module can be seen using the dir() function.

Example

List all constants:

from scipy import constants

print(dir(constants))

Unit Categories

The units are placed under these categories:

  • Metric
  • Binary
  • Mass
  • Angle
  • Time
  • Length
  • Pressure
  • Volume
  • Speed
  • Temperature
  • Energy
  • Power
  • Force
  • Metric (SI) Prefixes:

    Return the specified unit in meter (e.g. centi returns 0.01)

    Example

    from scipy import constants

    print(constants.yotta)    #1e+24
    print(constants.zetta)    #1e+21
    print(constants.exa)      #1e+18
    print(constants.peta)     #1000000000000000.0
    print(constants.tera)     #1000000000000.0
    print(constants.giga)     #1000000000.0
    print(constants.mega)     #1000000.0
    print(constants.kilo)     #1000.0
    print(constants.hecto)    #100.0
    print(constants.deka)     #10.0
    print(constants.deci)     #0.1
    print(constants.centi)    #0.01
    print(constants.milli)    #0.001
    print(constants.micro)    #1e-06
    print(constants.nano)     #1e-09
    print(constants.pico)     #1e-12
    print(constants.femto)    #1e-15
    print(constants.atto)     #1e-18
    print(constants.zepto)    #1e-21

    Binary Prefixes:

    Return the specified unit in bytes (e.g. kibi returns 1024)

    Example

    from scipy import constants

    print(constants.kibi)    #1024
    print(constants.mebi)    #1048576
    print(constants.gibi)    #1073741824
    print(constants.tebi)    #1099511627776
    print(constants.pebi)    #1125899906842624
    print(constants.exbi)    #1152921504606846976
    print(constants.zebi)    #1180591620717411303424
    print(constants.yobi)    #1208925819614629174706176

    Mass:

    Return the specified unit in kg (e.g. gram returns 0.001)

    Example

    from scipy import constants

    print(constants.gram)        #0.001
    print(constants.metric_ton)  #1000.0
    print(constants.grain)       #6.479891e-05
    print(constants.lb)          #0.45359236999999997
    print(constants.pound)       #0.45359236999999997
    print(constants.oz)          #0.028349523124999998
    print(constants.ounce)       #0.028349523124999998
    print(constants.stone)       #6.3502931799999995
    print(constants.long_ton)    #1016.0469088
    print(constants.short_ton)   #907.1847399999999
    print(constants.troy_ounce)  #0.031103476799999998
    print(constants.troy_pound)  #0.37324172159999996
    print(constants.carat)       #0.0002
    print(constants.atomic_mass) #1.66053904e-27
    print(constants.m_u)         #1.66053904e-27
    print(constants.u)           #1.66053904e-27

    Angle:

    Return the specified unit in radians (e.g. degree returns 0.017453292519943295)

    Example

    from scipy import constants

    print(constants.degree)     #0.017453292519943295
    print(constants.arcmin)     #0.0002908882086657216
    print(constants.arcminute)  #0.0002908882086657216
    print(constants.arcsec)     #4.84813681109536e-06
    print(constants.arcsecond)  #4.84813681109536e-06

    Time:

    Return the specified unit in seconds (e.g. hour returns 3600.0)

    Example

    from scipy import constants

    print(constants.minute)      #60.0
    print(constants.hour)        #3600.0
    print(constants.day)         #86400.0
    print(constants.week)        #604800.0
    print(constants.year)        #31536000.0
    print(constants.Julian_year) #31557600.0

    Length:

    Return the specified unit in meters (e.g. nautical_mile returns 1852.0)

    Example

    from scipy import constants

    print(constants.inch)              #0.0254
    print(constants.foot)              #0.30479999999999996
    print(constants.yard)              #0.9143999999999999
    print(constants.mile)              #1609.3439999999998
    print(constants.mil)               #2.5399999999999997e-05
    print(constants.pt)                #0.00035277777777777776
    print(constants.point)             #0.00035277777777777776
    print(constants.survey_foot)       #0.3048006096012192
    print(constants.survey_mile)       #1609.3472186944373
    print(constants.nautical_mile)     #1852.0
    print(constants.fermi)             #1e-15
    print(constants.angstrom)          #1e-10
    print(constants.micron)            #1e-06
    print(constants.au)                #149597870691.0
    print(constants.astronomical_unit) #149597870691.0
    print(constants.light_year)        #9460730472580800.0
    print(constants.parsec)            #3.0856775813057292e+16

    Pressure:

    Return the specified unit in pascals (e.g. psi returns 6894.757293168361)

    Example

    from scipy import constants

    print(constants.atm)         #101325.0
    print(constants.atmosphere)  #101325.0
    print(constants.bar)         #100000.0
    print(constants.torr)        #133.32236842105263
    print(constants.mmHg)        #133.32236842105263
    print(constants.psi)         #6894.757293168361

    Area:

    Return the specified unit in square meters(e.g. hectare returns 10000.0)

    Example

    from scipy import constants

    print(constants.hectare) #10000.0
    print(constants.acre)    #4046.8564223999992

    Volume:

    Return the specified unit in cubic meters (e.g. liter returns 0.001)

    Example

    from scipy import constants

    print(constants.liter)            #0.001
    print(constants.litre)            #0.001
    print(constants.gallon)           #0.0037854117839999997
    print(constants.gallon_US)        #0.0037854117839999997
    print(constants.gallon_imp)       #0.00454609
    print(constants.fluid_ounce)      #2.9573529562499998e-05
    print(constants.fluid_ounce_US)   #2.9573529562499998e-05
    print(constants.fluid_ounce_imp)  #2.84130625e-05
    print(constants.barrel)           #0.15898729492799998
    print(constants.bbl)              #0.15898729492799998

    Speed:

    Return the specified unit in meters per second (e.g. speed_of_sound returns 340.5)

    Example

    from scipy import constants

    print(constants.kmh)            #0.2777777777777778
    print(constants.mph)            #0.44703999999999994
    print(constants.mach)           #340.5
    print(constants.speed_of_sound) #340.5
    print(constants.knot)           #0.5144444444444445

    Temperature:

    Return the specified unit in Kelvin (e.g. zero_Celsius returns 273.15)

    Example

    from scipy import constants

    print(constants.zero_Celsius)      #273.15
    print(constants.degree_Fahrenheit) #0.5555555555555556

    Energy:

    Return the specified unit in joules (e.g. calorie returns 4.184)

    Example

    from scipy import constants

    print(constants.eV)            #1.6021766208e-19
    print(constants.electron_volt) #1.6021766208e-19
    print(constants.calorie)       #4.184
    print(constants.calorie_th)    #4.184
    print(constants.calorie_IT)    #4.1868
    print(constants.erg)           #1e-07
    print(constants.Btu)           #1055.05585262
    print(constants.Btu_IT)        #1055.05585262
    print(constants.Btu_th)        #1054.3502644888888
    print(constants.ton_TNT)       #4184000000.0

    Power:

    Return the specified unit in watts (e.g. horsepower returns 745.6998715822701)

    Example

    from scipy import constants

    print(constants.hp)         #745.6998715822701
    print(constants.horsepower) #745.6998715822701

    Force:

    Return the specified unit in newton (e.g. kilogram_force returns 9.80665)

    Example

    from scipy import constants

    print(constants.dyn)             #1e-05
    print(constants.dyne)            #1e-05
    print(constants.lbf)             #4.4482216152605
    print(constants.pound_force)     #4.4482216152605
    print(constants.kgf)             #9.80665
    print(constants.kilogram_force)  #9.80665

    Test Yourself With Exercises

    Exercise:

    Insert the correct syntax for printing the kilometer unit (in meters):

    print(constants.)
    

    Start the Exercise