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Please discuss the difference between gasification and vaporization

2009-04-12View Original

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Recently, while working on a paper, I keep running into the issue of vaporization and gasification. It seems to me that there is a difference between the two, but I can’t figure out what exactly it is. For example, when water changes from liquid water to gaseous water, which description is correct? Please give me some advice, fellow travelers.
Reply #22009-04-12
“In physics, “vaporization” refers to the process by which a substance changes from a liquid state to a gas state. “\"Vaporization\" in chemistry refers to the process of directly converting solid substances into gaseous substances through chemical changes. Such as coal gasification. Additionally, pressure and cooling can liquefy gases. Lowering the temperature will definitely achieve the goal. Pressure liquefaction, on the other hand, is subject to certain conditions; it must occur at temperatures below a specific value, and this temperature is known as the \"critical temperature\". Gases above the critical temperature are called “gas,” while gases below the critical temperature are called “vapor.” For example, the critical temperature of water is over 200 degrees Celsius; in other words, water vapor at temperatures above 100 degrees can be liquefied by applying pressure, as it is in a gaseous state. Steam at over 300 degrees will not liquefy no matter how much pressure is applied, because it is in a gaseous state. :handshake
Reply #32009-04-12
1. Evaporation is the phase change process in which a substance changes from a liquid state to a gas state.   The average distance between molecules in a liquid is much smaller than that in a gas. During vaporization, the average distance between molecules increases and the volume expands sharply; work must be done to overcome the intermolecular forces as well as resist atmospheric pressure. Therefore, vaporization absorbs heat. The heat absorbed per unit mass of liquid when it transforms into vapor at the same temperature is called the latent heat of vaporization, or simply vaporization heat. The heat of vaporization decreases as temperature rises, because at higher temperatures the liquid molecules possess greater kinetic energy, reducing the difference between the liquid and gas phases. At the critical temperature, a substance is in a critical state; the difference between the gas and liquid phases disappears, and the heat of vaporization is zero. Vaporization occurs in two forms: evaporation and boiling. The process by which a substance changes from a liquid state to a gas state is called vaporization. There are two different ways of vaporization: evaporation and boiling, and both of these processes require the absorption of heat.   Definition: 1. The process by which a substance changes from a liquid state to a gas state is called vaporization.   2. The vaporization phenomenon that can occur in a liquid at any temperature and takes place only on the surface of the liquid is called evaporation ; Boiling is a violent vaporization process that occurs simultaneously inside and on the surface of a liquid at a certain temperature.   3. Factors affecting the rate of evaporation: (1) Temperature of the liquid ; ⑵Surface area of liquids ⑶ Flow of air on the liquid surface.   Function: Evaporation absorbs heat (heat from the outside environment or from itself), thus providing a cooling effect.   4. Conditions for liquid boiling: ① The temperature reaches the boiling point; ② Heat continues to be absorbed. 2. In chemistry, it also refers to the process in which a solid substance is directly converted into a gaseous substance through a chemical reaction. Such as coal gasification
Reply #42009-04-12
Vaporization is the process by which a substance changes from a solid or liquid state to a gaseous state, with larger distances between molecules. Vaporization, on the other hand, refers to the transformation of a substance from a liquid state into small liquid particles that enter the air; the distance between water molecules in these particles remains unchanged, so it is still in a liquid state.
Reply #52014-04-04
It seems that vaporization is what is used frequently in everyday life

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