10.133/7/2024 Finally, at the critical temperature the meniscus disappears completely. In the first video, as the temperature nears the critical temperature, liquid and vapor become very similar in appearance and the meniscus between them becomes difficult to distinguish. ![]() ![]() The accompanying videos illustrate what happens experimentally in the case of Chlorine. The temperature at which this occurs is called the critical temperature, and the pressure is called the critical pressure. Since liquids are usually distinguished from gases on the basis of density, at this point both have become identical. Eventually we reach a temperature at which the density of the vapor becomes the same as that of the liquid. In other words, the vapor becomes considerably denser. (It is not a good idea to heat a liquid this way unless you are sure the container can withstand the increased pressure.) The rising vapor pressure corresponds to a greater number of molecules in the limited volume of the vapor phase. As we increase the temperature, the vapor pressure will rise. ![]() Suppose we seal a pure liquid and its vapor in a strong glass tube and heat it to a very high temperature.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |