What is the change of phase from a solid to a gas?
I know, liquid to gas is evaporation. So what if it skips the liquid part?
Help?
Sublimation.
Oh okay. Thank you bunches! (:
The change of phase directly from a solid to a gas is called sublimation. It occurs when a solid substance converts into a gas without passing through the intermediate liquid phase.
To understand how this happens, it is important to recognize that sublimation depends on various factors such as temperature, pressure, and the specific characteristics of the substance in question.
Here are a few examples of substances that can undergo sublimation:
1. Dry ice (solid carbon dioxide): Dry ice is commonly used for sublimation demonstrations. At atmospheric pressure, the temperature of dry ice is -78.5 degrees Celsius (-109.3 degrees Fahrenheit). At this temperature, dry ice directly changes into carbon dioxide gas without melting into a liquid state.
2. Iodine: Iodine is another substance that can sublimate. It typically undergoes sublimation at room temperature and atmospheric pressure. Solid iodine crystals change into a purple-colored gas when heated, without forming a liquid phase in between.
3. Camphor: Camphor is a white, waxy solid that can sublimate at room temperature. It releases a distinct odor when it transitions directly from solid to vapor.
If you encounter a substance that you suspect might undergo sublimation, you can perform a simple experiment. Place the solid in a controlled environment and observe whether it directly converts to a gas without any visible liquid formation. Keep in mind that not all substances exhibit the sublimation process, as it depends on their molecular structure and conditions.