Sublimation

Sublimation is the process in which a substance transitions directly from a solid to a gas without passing through the liquid state.

Explanation:

Sublimation occurs when the atmospheric pressure is lower than the vapor pressure of the solid substance. In this case, the solid absorbs heat and transforms into vapor without melting into a liquid first.

Examples of Sublimation:

• Carbon dioxide (dry ice) sublimes at room temperature and pressure, transitioning from a solid to a gas.
• Iodine also undergoes sublimation, turning directly from a solid to a purple vapor.

Study Guide:

When studying sublimation, consider the following key points:

1. Understand the concept of sublimation as the direct transition from a solid to a gas.
2. Learn about the conditions necessary for sublimation to occur, including the relationship between vapor pressure and atmospheric pressure.
3. Memorize examples of substances that undergo sublimation in the natural world and their applications.
4. Practice identifying sublimation in everyday scenarios, such as the behavior of dry ice.