Man Tan Zheng Fa Yu Fei Teng

Abstract

Evaporation and boiling are two types of vaporization. Students who are beginners in physics are often prone to misunderstandings such as "vaporization is carried out at a certain temperature"; ""a liquid absorbs heat during the evaporation process and the temperature remains unchanged"; "the boiling point of water is 100 °C" and other misunderstandings. The reason is that the two physical concepts of evaporation and boiling are confused, and the similarities and differences are not paid attention to. Now compare the two concepts as follows: 1. Similarities 1. Both are vaporization phenomena; 2, must absorb heat; 3. are affected by external factors. Second, the difference 1. Different parts of the evaporation only on the surface of the liquid; and boiling is carried out in the liquid and the surface at the same time. 2. When the degree of evaporation is different, the liquid vaporizes slowly; when it boils, the liquid vaporizes violently. 3. Different Temperature Limits Evaporation can occur at any temperature; boiling can only occur when the temperature reaches the boiling point and continues to absorb heat. 4 The speed of evaporation and the temperature of the liquid, the size of the liquid surface area and the air space of the liquid are affected by different factors.