The process in which a solid goes directly to gas is called sublimation.

Here's a breakdown:

* Solid: A state of matter with a definite shape and volume.

* Gas: A state of matter with no definite shape or volume.

* Sublimation: The transition of a substance from a solid to a gas phase without passing through the liquid phase.

Examples of Sublimation:

* Dry ice (solid carbon dioxide) sublimates into carbon dioxide gas at room temperature.

* Naphthalene (mothballs) slowly sublimate over time.

* Freeze-drying food involves sublimation, removing water from the food by freezing it and then lowering the pressure to cause the ice to sublimate.