# Units Module

Units in Warp Factory use functions that scale all values from S.I. units. These functions are called without pass-in values, and thus can also ignore the (). 

{% hint style="info" %}
These functions should be treated as reserved variables, make sure to avoid overlap in variable declarations to use these units properly.
{% endhint %}

For example, to set the unit scaling for some variable called `value`, which is implicitly defined in meters, we can say:

`value = 1*mm()` or `value = 1*mm`

This scales the value of 1 to mm, which would then be 0.001. This can also be used in the code to define what the units are explicitly in the code structure, such as calling `meter` which is unitary. 

The list of implemented unit scaling functions are:

* tonne
* second
* ms
* mm
* meter
* km
* kg
* gram
* cm

In addition, a few universal constants are used in the same manner as unit scaling. These are:

* G: Gravitational Constant - $$2.99792458\times10^{8}$$ \[m/s]
* c: Speed of Light - $$6.67430\times10^{-11}$$ \[m^3 / kg / s^2]