熱力，即是溫度，可說是烹飪的關鍵。大部分煮食過程，都牽涉到如何將熱力傳到天然食材，令食材轉化成易於消化和吸收的狀態。根據哈佛大學的白蘭教授，熱力除了可以提升食材的味道，掌握烹飪同時亦對人類演化起了極大作用。

電視版本：雙語廣播（粵語／英語）

"Heat" covers the temperature, which is the key to cooking. A major part of cooking involves delivering heat energy to natural things and transforming them to the state where they can be digested and absorbed. This technique does not stop at simply making food taste good. Professor Wrangham of Harvard University says the ability to produce food through heat is what helped humans evolve.

TV Version: Bilingual Broadcast (Cantonese/English)