Heat

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The metal spoon will feel hotter. Metals are good conductors of heat, so they transfer heat energy more quickly from hot water to your skin. Wood is a poor conductor, so it transfers less heat energy …

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Heat is energy in transit that flows from a hotter body to a colder body. Temperature is a measure of the degree of hotness or coldness of a body. Heat is the energy that flows, while temperature dete…

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Given: m = 2 kg, ΔT = 80°C - 20°C = 60°C = 60K, s = 4180 J/kg-K Using Q = msΔT Q = 2 × 4180 × 60 = 501,600 J = 501.6 kJ Therefore, 501.6 kJ of heat is required.

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Water has high specific heat (4180 J/kg-K) because heat energy is used for breaking hydrogen bonds between molecules, not just increasing kinetic energy. Practical implications: Ocean temperature rema…

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Thermal equilibrium occurs when two bodies in contact reach the same temperature and no heat flows between them. Example: When you put a thermometer in your mouth, initially heat flows from your body …

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The outer covering (bread) has lower specific heat and cools down quickly. The inner filling (vegetables/curry) has higher specific heat capacity due to water content and retains heat longer. This is …

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When bodies at different temperatures are brought into thermal contact, net heat lost by hot bodies equals net heat gained by cold bodies until thermal equilibrium is reached. Mathematical form: Heat …

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During evaporation, high-energy molecules escape from the liquid surface, leaving behind molecules with lower average kinetic energy, thus cooling the liquid. When we sweat, water evaporates from skin…