kiehumispisteinä

Kiehumispisteinä refers to the boiling points of substances. The boiling point is the temperature at which a liquid turns into a gas or vapor at a given pressure. When a liquid is heated, its molecules gain kinetic energy and move faster. Eventually, they gain enough energy to overcome the intermolecular forces holding them together in the liquid state. At this point, the vapor pressure of the liquid equals the surrounding atmospheric pressure, and boiling occurs throughout the bulk of the liquid, not just at the surface.

The boiling point is an intrinsic property of a pure substance, meaning it is a characteristic that does not depend on the amount of the substance present. However, it is highly dependent on the pressure. For example, water boils at 100 degrees Celsius (212 degrees Fahrenheit) at standard atmospheric pressure (1 atmosphere or 101.325 kilopascals). At higher altitudes, where atmospheric pressure is lower, water boils at a lower temperature. Conversely, under higher pressure, water boils at a higher temperature.

Mixtures of substances generally do not have a single, sharp boiling point like pure substances. Instead, they boil over a range of temperatures. The composition of the vapor phase is usually different from the composition of the liquid phase during boiling. This phenomenon is utilized in processes like distillation to separate components of a mixture based on their different boiling points. Understanding boiling points is crucial in many scientific and engineering applications, including chemical processing, cooking, and meteorology.