Evporation is the physical process through which a liquid converts to a gas on absorbing heat. For example, liquid water from oceans, lakes, rivers and other water bodies, undergoes evaporation (changes into gas) by absorbing heat from the Sun.

Gases have indefinite shape and size. Particles of gases move around freely and have very weak forces of attraction between them.

When heat is supplied to ice, it converts to liquid water. The process of converting solid into liquid by applying heat is known as melting.

When water is below its freezing point, water particles come closer. Their interparticle forces of attraction increases and they form a rigid structure called ice.

Melting is a physical process through which a solid is converted into a liquid. When a solid is heated, the distance between the particles increases, forces of attraction decreases. Eventually, the solid converts to liquid.

When heat is supplied to liquid water it converts to water vapour (gaseous state). 

A saturated solution is a solution in which no more solute can be dissolved in solvent without heating the solution.

Among the given, water is the substance which is in the liquid state at room temperature.