The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the ______ heat of fusion.
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Correct answer: A
Explanation
Latent heat of fusion -
When we heat a solid substance (such as ice), after reaching a certain temperature (melting point), the temperature does not increase until all the ice melts.
The heat supplied during this process is used to change the state of the substance, which is called 'latent' or 'latent' heat.
Definition: The amount of thermal energy required to change 1 kilogram of a solid at atmospheric pressure into a liquid at its melting point is called the latent heat of fusion.
Temperature change: The temperature remains constant during this process because heat is used to break the force of attraction between the particles.
Example of ice: Water particles at 0°C have more energy than ice particles at the same temperature (0°C).