The name of the process where solid is directly converted into gas is sublimation.

Explanation:
Sublimation is a process in which a solid substance changes directly into a gaseous state without passing through the liquid phase. This process occurs when the surrounding temperature and pressure conditions are suitable for the solid to bypass the liquid phase and convert into a gas.

Here is a detailed explanation of the sublimation process:

1. Definition of Sublimation:
Sublimation is a phase transition process in which a solid substance transforms into a gas without going through the liquid phase. This process is the opposite of deposition, where a gas changes directly into a solid.

2. Energy Transfer:
During sublimation, energy is transferred to the solid substance, usually in the form of heat. This added energy breaks the intermolecular forces holding the particles together, allowing them to escape from the solid state and enter the gas phase.

3. Temperature and Pressure:
For sublimation to occur, specific temperature and pressure conditions are required. The temperature must be below the substance's melting point but above its freezing point. Additionally, the pressure must be low enough to prevent the substance from liquefying.

4. Examples of Sublimation:
Several substances exhibit sublimation at normal atmospheric pressure and temperature conditions. Some common examples include dry ice (solid carbon dioxide), mothballs (naphthalene), camphor, and iodine.

5. Applications of Sublimation:
Sublimation has various practical applications. For example:
- In freeze-drying, sublimation is used to remove water from frozen foods, pharmaceuticals, and biological materials, preserving them for longer periods.
- Sublimation is also utilized in air fresheners and room deodorizers, where solid compounds undergo sublimation to release pleasant scents.
- During winter, the process of sublimation is responsible for the formation of frost on cold surfaces.

In conclusion, sublimation is the process where a solid substance changes directly into a gas without passing through the liquid phase. It is a unique phase transition that occurs under specific temperature and pressure conditions. Sublimation has several practical applications in various fields.