Here's a breakdown:
* Solid to Liquid: When ice melts, it transitions from a solid state to a liquid state, a process called melting.
* Liquid to Gas: When water boils or evaporates, it transitions from a liquid state to a gaseous state, a process called vaporization (or boiling for the specific case of reaching the boiling point).
* Solid to Gas: Sublimation is the process where a substance transitions directly from a solid state to a gaseous state, skipping the liquid phase entirely.
Think of dry ice (solid carbon dioxide) which turns directly into a gas at room temperature. That's another example of sublimation.
