乾かん燥そう質しつ量りょう

Meanings

1

noun

dry mass

Technical term used in science and engineering to refer to the mass of a substance after removing all water content.

quantity, measure, weight

湿しつ潤じゅん質しつ量りょう
湿潤質量 refers to the mass including water content, while 乾燥質量 is the mass after drying.
水すい分ぶん
水分 is the water content itself, often subtracted to obtain 乾燥質量.

Compound of 乾燥 (drying) and 質量 (mass). A straightforward technical term with no obscure historical derivation.