lifecycle-kit / chem / KG_PER_TISSUE_UNIT

Variable: KG_PER_TISSUE_UNIT

const KG_PER_TISSUE_UNIT: 0.05 = 0.05

Tissue units per kilogram.

bodyMass() counts tissue units, which are arbitrary — a newborn is 3 and a grown pet is a few dozen. The peer-reviewed scaling laws in src/bio-laws are all calibrated in KILOGRAMS, and feeding them raw tissue units would produce numbers that typecheck and mean nothing: Damuth's law on a "mass" of 8 would report the population density of an eight-kilogram animal.

So the conversion is explicit and lives here, next to the thing it converts. One unit is 50 g, which puts a newborn at 150 g and a well-grown creature in the low kilograms — the range of a small mammal, which is what this creature reads as.