Which heat transfer occurs by direct contact between materials?

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Multiple Choice

Which heat transfer occurs by direct contact between materials?

Direct contact is needed for conduction. When two materials touch, heat moves from the part that is hotter to the part that is cooler by the collisions and interactions of their particles (and, in metals, by free electrons shuttling energy quickly). This is why a hot spoon left in a pot warms along its length toward the handle—the heat travels through the solid by contact. Convection uses moving fluids to carry heat, not just contact between solids. Radiation transfers energy as waves and can occur through empty space, without touching anything. Evaporation involves a surface change from liquid to vapor, using energy to break intermolecular bonds, not direct heat transfer between touching materials.

Direct contact is needed for conduction. When two materials touch, heat moves from the part that is hotter to the part that is cooler by the collisions and interactions of their particles (and, in metals, by free electrons shuttling energy quickly). This is why a hot spoon left in a pot warms along its length toward the handle—the heat travels through the solid by contact. Convection uses moving fluids to carry heat, not just contact between solids. Radiation transfers energy as waves and can occur through empty space, without touching anything. Evaporation involves a surface change from liquid to vapor, using energy to break intermolecular bonds, not direct heat transfer between touching materials.

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