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When a butter melts in your mouth, it's letter B. Convection. The butter melts in your mouth cause the transfer of heat through our mouth fluid which is likely called saliva. Convection is the transfer of heat by gas or liquid.
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Its due to convection, butter meltsin our mouth.convection is the transference of heat by the actual movement of molecules.convection is possble only in liquids,and the liquid used is saliva present in the mouth