Answer :
Conduction causes the Thermal energy flows out of your hand into the chocolate bar and it starts off evolved to soften.
This approach that your (hand) is shifting strength to the chocolate bar inflicting it to revel in a segment extrade from stable to liquid. Conduction Chocolate sweet for your hand will finally soften as the warmth out of your frame is launched and makes it melted.
The melting factor of chocolate falls among 86°F and 90°F. This is substantially decrease than the common temperature of the human frame, that's 98.6°F so the warmth out of your hand increases the temperature of the chocolate and reasons it to soften.
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