Wiktionary
empirical formulas
n. (empirical formula English)
Usage examples of "empirical formulas".
They even have a mathematics for it, with empirical formulas and symbols for “.
Biomechanicians have worked out complex empirical formulas describing body deterioration and the measures which must be taken to offset it under various conditions of impressed acceleration, ambient temperature, the drugs used, and other factors such as metabolic age, body mass, sex, and so forth.