This is the 1391st most frequent Japanese word.
加熱
"加熱" means "heating" or "to heat."
加熱 is used here to indicate the act of applying heat to the soup to warm it.
スープを加熱して温かくしました。
I heated the soup to make it warm.
加熱 is employed to refer to the process of heating the food, emphasizing avoiding excessive application of heat.
この料理は加熱しすぎずに作るのがポイントです。
The key to this dish is to prepare it without overheating.
加熱 is in reference to the general application of heat which can lead to chemical or physical changes in materials.