Densification refers to the process that a substance directly changes from a gaseous state to a solid state. This phenomenon usually occurs when the temperature drops, and gas molecules lose energy and become inactive, thus condensing into solids. For example, the formation of frost is the result of condensation of water vapor in cold air.
Sublimation refers to the process in which a substance directly changes from a solid state to a gas state. This phenomenon usually occurs when the temperature rises, and solid molecules will absorb energy and become active, thus sublimating into gas. For example, mothballs will gradually disappear in the air, because the camphor component in mothballs has sublimated.
Sublimation and sublimation are both phase change processes in physical phenomena, but in opposite directions. Densification is a process in which a substance changes from a gaseous state to a solid state, while sublimation is a process in which a substance changes from a solid state to a gaseous state. These two phenomena exist widely in nature, such as the melting of glaciers, the formation of snowflakes and the disappearance of mothballs.
In industry and daily life, people will also use sublimation and sublimation principle for some applications. For example, drying, cooling or separation by sublimation; Make snowflakes, frost flowers and other works of art by using condensation phenomenon.
In physics, other phase change processes except sublimation and sublimation;
1. Liquefaction refers to the process that a substance changes from a gas state to a liquid state. This phenomenon usually occurs when the temperature drops, and gas molecules lose energy and gather together, thus becoming liquid. For example, when the temperature drops, the water vapor in the air will liquefy into water droplets, which is our common raindrop formation process.
2. Vaporization refers to the process of changing substances from liquid to gas. This phenomenon usually occurs when the temperature rises, and liquid molecules become active in absorbing energy, thus becoming gas. For example, if we boil in water, the water will gradually decrease and form steam, which is because water molecules absorb heat and vaporize.
3. These phase transition processes are widely used in nature and human life. For example, we use the principles of liquefaction and vaporization in refrigeration and air conditioning, and also use various phase change phenomena for separation, drying and cooling in industrial and medical fields.