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Primel in fact uses the maximal density of water as its coherent unit of density, the ′densitel ⚀densitel. This has a value of 999.972d kilograms per cubic meter (or 0.999972d kilograms per liter, or grams per milliliter) and occurs at 3.98d°C = 39.16d°F (equivalent to ᘔ.035z ′stadegrees ⚀stadegrees on the crystallic scale).
This value for the ′densitel ⚀densitel leads to a unit of mass, the ′massel ⚀massel, of about 0.555508d grams (nickname: ′morsel⚀morsel·mass). This makes for a rather small base unit of mass. However, when scaled up three orders of dozenal magnitude, the ⚀triqua·massel (nickname: ′hand·mass) is remarkably convenient at just under 1 kilogram and just over 2 pounds (just as the ⚀triqua·volumel is convenient at just under 1 liter or just over a USC quart). Since this is the same as the mass of water occupying a ⚀hand·volume (a cubic ⚀hand·length), it can be colloquialized as a ⚀hand·mass.
Because Earth's gravity is the unit of acceleration (1 ′accelerel ⚀accelerel = 1 ′gravity⚀gravity), whatever the mass of anything is in ′massels ⚀massels, the force of its weight in ′forcels ⚀forcels (or ′weightels ⚀weightels) will be numerically the same (more or less, given the latitudinal variation of gravity on Earth). So we could easily speak of the mass of something in ′morsel⚀morsel·masses or ′hand⚀hand·masses, and its weight in ′morsel⚀morsel·weights or ′hand⚀hand·weights, using (approximately) the same magnitudes. Contrast this with the situation in SI, with kilograms of mass versus newtons of weight, with the factor of 9.80665d m/s2 in between.
From the ′forcel ⚀forcel, in straightforward fashion we can derive units for energy (the ′energiel ⚀energiel or ′workel ⚀workel), for power (the ′powerel ⚀powerel), for pressure (the ′pressurel ⚀pressurel), and for the rest of Newtonian mechanics.