The characteristic coefficient is expressed either in revolutions per kilometre (w = … rev/km) or in impulses per kilometre (w = … imp/km);
Léirítear an comhéifeacht tréithe mar imrothluithe in aghaidh an chiliméadair (w = … rev/km) nó spreagthaí in aghaidh an chiliméadair (w = … imp/km);