I should qualify the statement in the first sentence above; my calculations indicate that it is true in South Australia and in terms of the amount of energy per unit mass of fuel. (ramblingsdc.net)
This is the reason for which VO2max is generally measured on a per unit mass basis, it reduces the obvious disparities that will be observed in people of differing total body mass. (shapesense.com)
You vary («calibrate») conductivity and potential change per unit mass change in each cell until your model can reproduce the observed values over a given historical period. (realclimate.org)