質量 しつりょう保存 ほぞん法則 ほうそくでしょう
shitsuryōhozonno hōsokudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 質量保存の法則

1. Probably the law of conservation of mass.

Polite
Presumptive
Conjecture