xoutil.dim.base - The base physical quantities

The standard physical quantities.

class xoutil.dim.base.Length

The Length base quantity.

metre

The canonical unit.

m

An alias of metre

Other attributes:

kilometre

km

centimetre

cm

millimetre

mm

nanometre

nm

class xoutil.dim.base.Time

The Time base quantity.

second

The canonical unit.

s

An alias of second

Other attributes:

millisecond

ms

nanosecond

ns

minute

hour

class xoutil.dim.base.Mass

The Mass base quantity.

kilogram

The canonical unit.

kg

An alias of kilogram

Other attributes:

gram

class xoutil.dim.base.ElectricCurrent

The electrical current base quantity.

ampere

The canonical unit.

A

An alias of ampere

class xoutil.dim.base.Temperature

The thermodynamic temperature base quantity.

kelvin

The canonical unit.

K

An alias of kelvin

classmethod from_celcius(val)

Convert val ºC to K

classmethod from_fahrenheit(val)

Convert val ºF to K

class xoutil.dim.base.Substance

The amount of substance.

mole

mol

An alias of mole.

class xoutil.dim.base.Luminosity

The luminous intensity base quantity.

candela

Aliases

class xoutil.dim.base.L

An alias of Length

class xoutil.dim.base.T

An alias of Time

class xoutil.dim.base.M

An alias of Mass

class xoutil.dim.base.I

An alias of ElectricCurrent

class xoutil.dim.base.O

An alias of Temperature. We can’t really use the Greek Theta Θ

class xoutil.dim.base.N

An alias of Substance

class xoutil.dim.base.J

An alias of Luminosity

Derived quantities

class xoutil.dim.base.Area

Defined as L**2.

metre_squared

The canonical unit.

class xoutil.dim.base.Volume

Defined as L**3.

metre_cubic

The canonical unit.

class xoutil.dim.base.Frequency

Defined as T**-1 (which is the same as 1/T).

unit_per_second

The canonical unit.

Aliases of the canonical unit:

Hz

class xoutil.dim.base.Force

Defined as L * M * T**-2.

metre_kilogram_per_second_squared

The canonical unit.

Aliases of the canonical unit:

N

Newton

class xoutil.dim.base.Presure

Defined as L**-1 * M * T**-2.

kilogram_per_metre_per_second_squared

Aliases of the canonical unit:

pascal

Pa

class xoutil.dim.base.Velocity

Defined as L * T**-1.

metre_per_second

The canonical unit.

class xoutil.dim.base.Acceleration

Defined as L * T**-2.

metre_per_second_squared

The canonical unit.

On the automatically created names for derived quantities

We automatically create the name of the canonical unit of quantities derived from others by simple rules:

• A * B joins the canonical unit names together with a low dash ‘_’ in-between. Let’s represent it as a_b, where a stands for the name of the canonical unit of A and b, the canonical unit of B.

  For the case, A * A the unit name is a_squared.

• A/B gets the name a_per_b. 1/A gets the name unit_per_a

• A**n; when n=1 this is the same as A; when n=2 this is the same as A * A; for other positive values of n, the canonical unit name is a_pow_n; for negative values of n is the same as 1/A**n; for n=0 this is the Scalar quantity.