Heat — Flashcards

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Heat is a form of energy that flows from a hotter body to a colder body. Temperature tells how hot or cold a body is. Heat depends on the amount of substance, but temperature does not depend on mass i…

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Heat is transferred in three main ways: conduction, convection, and radiation. Conduction happens mainly in solids, convection in liquids and gases, and radiation can happen without a medium.

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The mixture stays at 0°C till all the ice melts. The supplied heat is used in changing ice into water, not in raising temperature. This heat is called latent heat of fusion.

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"The heat energy absorbed at constant temperature during transformation of solid into liquid is called the latent heat of fusion." It is the heat needed for change of state without temperature rise.

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"The amount of heat energy absorbed at constant temperature by unit mass of a solid to convert into liquid phase is called the specific latent heat of fusion." For water/ice, it is 333 kJ/kg or 80 cal…

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The temperature of water rises from 0°C to 100°C. After that, it stays constant at 100°C till all the water changes into steam. The heat used in this change is latent heat of vaporization.

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"The heat energy absorbed at constant temperature during transformation of liquid into gas is called the latent heat of vapourization." It is used during boiling, not for raising temperature.

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"The amount of heat energy absorbed at constant temperature by unit mass of a liquid to convert into gaseous phase is called the specific latent heat of vapourization." For water, it is 2256 kJ/kg or …