Sublimation is the process in which molecules of a substance in the solid state go to the vapor state directly, without going through the liquid state. According to the kinetic molecular theory, we know that molecules are in constant random motion, even when the substance is below the melting point. We also know that the average speed of the molecules (kinetic energy) is directly proportional to the absolute temperature. If the molecules are below the melting point and are kept in the solid state by relatively weak intermolecular forces (compared to the strength of the covalent bonds within the molecule) then sometimes a molecule will have enough energy to break those intermolecular bonds and go into the vapour state. There are many substances that undergo sublimation. Carbon dioxide, camphor, and naphthalene are material that easily undergoes sublimation.
Diagram image pending upload by Admin.
Diagram image pending upload by Admin.
Application of Sublimation in our life
The solid air fresheners we often use in our cars and homes rely solely on the magic of sublimation. The solid fragrance within slowly transforms into a delightful vapour, filling the entire space with an enticing aroma that lingers in the air. In the textile industry 3D printing uses a sublimation process. Dye sublimation printers are now widely used for the printing process for a reduced cost. Dye sublimation is used to print a variety of objects such as T- shirts, pens, coffee mugs, and bags. In the food industry, freeze- drying food items for preservation for a longer duration is due to the process of sublimation.
Simple examples of deposition in daily life. Did you get it.!!
The formation process of snow from water vapour. Black Soot inside a Vehicle Exhaust. The Making Process of Dry Ice Using Carbon Dioxide.