So if you were wanting a pretty precise number on how many calories are in a food, you'd send it to a lab.

所以如果想要一个精确的,食物所含卡路里的数值,就把食物送到实验室

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And, in particular, he introduced a quantitative measure.

他还通过实验给出了数值标准。

麻省理工公开课 - 固态化学导论课程节选