Question

The process involving the change of state direct from solid to gas is called
1. melting
2. boiling
3. fusion
4. sublimation

Answer 1

Correct Answer - Option 4 : sublimation

The correct answer is sublimation.

• The solid-to-gas change is called sublimation, while the reverse process is called deposition.
• Sublimation is isothermal, like the other phase changes.
• There is a measurable energy change during sublimation; this energy change is called the enthalpy of sublimation, represented as ΔH sub.

• Melting is the process by which a substance changes from the solid phase to the liquid phase.
• Melting occurs when the internal energy of solid increases, usually through the application of heat or pressure, such that the molecules become less ordered.
• Boiling happens when a liquid becomes gas, forming bubbles inside the liquid volume.
• In cooking, water is the most frequently used liquid that is boiled.
• The temperature when water will begin to boil is around 212 degrees Fahrenheit/100 degrees Celsius. This is called the boiling point.