Sublimation is the conversion of a:
**Core Concept**
Sublimation is a phase transition process in physics and chemistry, involving a change in state. It occurs when a **solid** transforms directly into a **gas** without going through the liquid phase. This process is an important concept in understanding the properties of matter.
**Why the Correct Answer is Right**
The correct answer is related to the definition of sublimation, which involves the transition of a substance from the **solid** state to the **gas** state. This process is characterized by the absorption of heat energy, allowing the solid to change directly into a gas. Examples of substances that undergo sublimation include **iodine** and **dry ice**.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because sublimation does not involve the conversion of a liquid to a gas, which is known as **evaporation** or **vaporization**.
**Option B:** This option is incorrect because sublimation does not involve the conversion of a gas to a liquid, which is known as **condensation**.
**Option C:** This option is incorrect because sublimation does not involve the conversion of a liquid to a solid, which is known as **freezing** or **solidification**.
**Clinical Pearl / High-Yield Fact**
Sublimation is an important concept in various fields, including chemistry, physics, and materials science. Remembering the definition of sublimation and its distinction from other phase transitions is crucial for understanding the behavior of substances under different conditions.
**Correct Answer:** D. solid to a gas.