Usage edit

{{Quantity
<!----Core parameters (required)---->
|quantity      =  <!-- Physical quantity being described (eg. mass, length, volume) -->
|sym           =  <!-- Usual symbol of the physical quantity -->
|dim           =  <!-- Dimension of quantity (eg L^-3 M, -->

<!----Optional parameters (not required)---->
|si            =  <!-- Base unit in the SI system of units -->
|sisym         =  <!-- Symbol of base unit in SI system -->
|cgs           =  <!-- Base unit in the CGS system of units -->
|cgssym        =  <!-- Symbol of base unit in CGS system -->
|imp           =  <!-- Base unit in the Imperial system of units -->
|impsym        =  <!-- Symbol of base unit in Imperial system -->

|nocoherent    =  <!-- If no coherent units exist, enter "yes" to turn off the "Coherent Units" heading -->
}}