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    Question

    When a liquid is heated in a container, which of the

    following processes primarily causes the heat transfer within the liquid?  
    A Radiation Correct Answer Incorrect Answer
    B Conduction Correct Answer Incorrect Answer
    C Convection Correct Answer Incorrect Answer
    D Reflection Correct Answer Incorrect Answer

    Solution

    In liquids and gases, convection is the primary mode of heat transfer.   Hot liquid becomes lighter (lower density) and rises, while cooler liquid (higher density) sinks, creating convection currents.   Conduction happens mainly in solids; radiation involves electromagnetic waves and does not need a medium.

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