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Questions and Answers
The unit of ______ heat capacity is J kg-1.
specific latent
The increase in length, area or volume taking place when an object is heated up is known as ______ expansion.
thermal
The ______ of heat from a point at a higher temperature to a point at a lower temperature is known as heat transfer.
flow
The three methods of ______ transfer are conduction, convection and radiation.
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The amount of heat required to increase the temperature of a unit mass of the object by one temperature unit is known as ______ heat capacity.
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The heat required to convert a unit mass of a solid at its melting point into a liquid at the same temperature is known as ______ latent heat capacity of fusion.
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[Blank] is the forward flow of heat through any material by heating up of the constituent particles one by one in succession.
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The heat required to convert a unit mass of a liquid at its boiling point into a vapor at the same temperature is known as ______ latent heat capacity of vaporization.
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The quantity of heat Q is equal to ______ x θ.
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The heat capacity C is equal to ______ x c.
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Study Notes
Latent Heat
- The amount of heat required to change the state of a unit mass of a solid substance at its melting point into a liquid state is known as the specific latent heat of fusion of the substance.
- The specific latent heat of fusion of ice is 3.36 × 10^5 J/kg.
- The amount of heat required to change the state of a unit mass of a liquid at its boiling point into a gas state is known as the specific latent heat of vaporization of the substance.
- The specific latent heat of vaporization of water is 2.26 × 10^6 J/kg.
Evaporation and Vaporization
- The conversion of a liquid into a gaseous state is called vaporization.
- Vaporization can occur through boiling or evaporation.
- Boiling occurs at the boiling point of a liquid when further heat is supplied.
- Evaporation occurs below the boiling point of a liquid.
- Evaporation takes place only at the surface of a liquid exposed to air.
Heat Capacity and Specific Heat Capacity
- Heat capacity (C) of an object is the amount of heat required to increase its temperature by one temperature unit.
- Units of heat capacity are J K^-1 or J °C^-1.
- Specific heat capacity (c) of an object is the amount of heat required to increase the temperature of a unit mass of the object by one temperature unit.
- Units for measuring specific heat capacity are J kg^-1 K^-1 or J kg^-1 °C^-1.
Latent Heat and Thermal Expansion
- Latent heat is the amount of heat absorbed or released in a change of state of a substance without changing its temperature.
- The increase in length, area, or volume of an object when heated is known as thermal expansion.
Heat Transfer
- Heat transfer is the flow of heat from a point at a higher temperature to a point at a lower temperature.
- The three methods of heat transfer are conduction, convection, and radiation.
- Conduction is the forward flow of heat through any material by heating up of the constituent particles one by one in succession.
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Description
Learn about the amount of heat required to change the state of a substance from solid to liquid or from liquid to gas, and practice problems related to specific latent heat of fusion and vaporization.
