The answer is 5.
When a liquid silver is poured into a mold and cools down to become a solid bar is a transition in which the liquid phase is converted into a solid phase which is termed solidification represented by arrow number 5.
Whereas other arrows represent:
Arrow 1 represents the vaporization process where the liquid state changes to a gaseous state.
Arrow 2 represents the Fusion process where the solid-state changes to a liquid state.
Arrow 3 represents the sublimation process where the solid-state changes to a gaseous state by escaping the liquid state.
Arrow 4 represents the condensation process where the gaseous state changes to a liquid state.
Arrow 6 represents the deposition process where the gaseous state changes to a solid state by escaping the liquid state.
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