Question

Name the phenomenon which causes conversion of Ice into water.

Answer 1

Condensation is the process of changing the physical state of matter from gas to liquid. It is the inverse of vaporization. The term is most commonly used to describe the water cycle. It's also known as the transformation of water vapor into liquid water when it comes into contact with a liquid or solid surface, or cloud condensation nuclei in the atmosphere. Deposition occurs when a shift occurs straight from the gaseous to the solid phase.

Complete answer:
Melting is the process of turning ice into water. Melting, also known as fusion, is a physical process that causes a substance's phase shift from solid to liquid. When the internal energy of a solid increases, usually due to the application of heat or pressure, the temperature of the substance rises to the melting point. The ordering of ions or molecules in a solid breaks down to a less ordered state at the melting point, and the solid "melts" to become a liquid.
The viscosity of substances in the molten state decreases as the temperature rises.
The change in Gibbs free energy G of the substances is zero at the melting point, but there are non-zero increases in enthalpy (H) and entropy (S), which are known as the enthalpy of fusion (or latent heat of fusion) and the entropy of fusion, respectively. As a result, melting is classed as a first-order phase transition. Melting happens when the liquid's Gibbs free energy falls below that of the solid for that substance. The ambient pressure determines the temperature at which this happens.

Note:
Condensation occurs when atomic/molecular clusters of that species develop inside its gaseous volume—like rain drops or snow flake production within clouds—or when that gaseous phase comes into contact with a liquid or solid surface. Water-nucleating proteins, which are generated by atmospheric microorganisms and capable of binding gaseous or liquid water molecules, can accelerate this process in clouds.