Generally speaking, the oil temperature is expressed by "Cheng". 10% oil temperature is about 23℃, and the commonly used oil temperatures are divided into three categories: warm oil pan, commonly known as 30% to 40% heat, and the temperature is between 90℃ and 130℃. Generally, the oil level is smokeless and noiseless, and the oil level is relatively calm. When the raw materials are put into the pot, a small amount of bubbles appear around the raw materials. Hot oil pan, commonly known as 50% to 60% hot, the temperature is 130℃ to 170℃, the oil level is slightly smoky, and the oil turns from all sides to the middle. When the raw materials are put into the pot, a large number of bubbles appear around the raw materials and do not burst. King oil pan, commonly known as 70% to 80% hot, temperature 170℃ to 230℃. The oil level is characterized by a large increase in smoke, a calm oil level and a noise when stirring with a spoon. When the raw materials are put into the pot, a large number of bubbles appear with a slight explosion.

In actual combat, we can only grasp it by experience.