The gallium metal melt in a person's hand because the gallium atoms will increase in temperature at its melting point.
What is melting point?
The melting point also called as liquefaction is the process by which the solid substance turns into liquid upon giving heat energy. There is equilibrium established between the solid and liquid phase during melting of a substance.
The gallium metal has low melting point and upon touching a person's hand the atoms heat up and there is increase in temperature which is enough to melt it. The atoms heat up and liquify as it reaches its melting point.
Therefore, when the gallium metal is kept on a person's hand the atoms heat up and melt upon reaching its melting point.
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