The process when a gaseous substance changes states to become a solid is called deposition. Gas is a state of matter which contains molecules with a high amount of kinetic or moving energy, and they vibrate very quickly. A solid has particles that have less kinetic energy and vibrate at a slower rate without changing position.
The gaseous substance may get deposited as a crystal bypassing the intermediate liquid state. A common gas-to-solid conversation example is the formation of frost, which occurs when water vapour (gaseous form) in the atmosphere changes directly into ice. The deposition process is the opposite of sublimation.
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Examples of Gas to Solid
- Making dry ice or solid carbon dioxide involves removing gaseous carbon dioxide from the air and causing the gas particles to skip the liquid phase and deposit into a solid to form a chunk of dry ice using cold temperatures and higher pressure.
- A carbon dioxide fire extinguisher is filled with gaseous carbon dioxide, but the higher pressure inside the canister causes this to turn into solid carbon dioxide, which is then released as a white powder when used to extinguish a fire.
- The deposition process is important in many manufacturing technologies, such as semiconductor manufacturing. Solid alloys are heated to a gaseous state before being sprayed onto objects such as semiconductors in this process. The heat energy is lost when the spray hits the semiconductor, and the gaseous substance solidifies into a metal alloy.
Sublimation Process
Sublimation is a solid-to-gas transformation. Dry ice is one of many sublimation examples (frozen carbon dioxide). When dry ice is exposed to air, it changes directly from a solid to a gaseous state (fog).
In general, converting a solid to a gaseous state necessitates an intermediate liquid state.
Sublimation, on the other hand, occurs when solid molecules absorb heat and directly change to a gaseous state. This process involves a physical change of state rather than a chemical reaction.
More Links
| How cold is Liquid Nitrogen? | Condensation Definition| Chemistry |
| What is a Volatile Substance?| Easy Examples | Distillation| Principles, and Processes |
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