Well what you do is you bomb the food and you use something called the bomb calorimeter that looks like this, and so essentially what you do is you put the food in this device that sits inside water.

我们要做的是燃烧食物,使用一种叫弹式量热器的工具,像这样,把食物放入这种仪器中,仪器会浸入水里

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选