Mechanical Engineering Exam > Mechanical Engineering Questions > Thermal diffusivity of a substance is:a)Inver...
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Thermal diffusivity of a substance is:
- a)Inversely proportional to thermal conductivity
- b)Directly proportional to thermal conductivity
- c)Directly proportional to the square of thermal conductivity
- d)Inversely proportional to the square of thermal conductivity
Correct answer is option 'B'. Can you explain this answer?
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Thermal diffusivity of a substance is:a)Inversely proportional to ther...
Ans. (b) Thermal diffusivity
(α) = 
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Thermal diffusivity of a substance is:a)Inversely proportional to ther...
Thermal diffusivity is an important property of a substance that determines the rate at which it can conduct heat. It is defined as the ratio of thermal conductivity to specific heat capacity and density. The SI unit of thermal diffusivity is m²/s.
Relation between thermal diffusivity and thermal conductivity:
- Thermal diffusivity is directly proportional to thermal conductivity. This means that as the thermal conductivity of a substance increases, its thermal diffusivity will also increase.
- The ratio of thermal conductivity to specific heat capacity determines how quickly heat will be conducted through a substance. A high thermal conductivity means that heat will be transferred quickly, while a low thermal conductivity means that heat will be transferred more slowly.
- Specific heat capacity is a measure of how much heat energy is required to raise the temperature of a substance by a certain amount. Density is a measure of the mass of a substance per unit volume. A substance with a high specific heat capacity and low density will have a higher thermal diffusivity than a substance with a low specific heat capacity and high density.
Applications of thermal diffusivity:
- Thermal diffusivity is an important property in many engineering applications, such as designing heat exchangers, calculating heat transfer rates, and analyzing thermal insulation materials.
- It is used to determine the thermal response of materials to different heating and cooling conditions, which is important in many manufacturing processes.
- Thermal diffusivity is also used in geothermal studies to analyze the thermal conductivity of rocks and soil.
Conclusion:
Thermal diffusivity is an important property that determines the rate at which a substance can conduct heat. It is directly proportional to thermal conductivity and is used in many engineering and scientific applications.
Relation between thermal diffusivity and thermal conductivity:
- Thermal diffusivity is directly proportional to thermal conductivity. This means that as the thermal conductivity of a substance increases, its thermal diffusivity will also increase.
- The ratio of thermal conductivity to specific heat capacity determines how quickly heat will be conducted through a substance. A high thermal conductivity means that heat will be transferred quickly, while a low thermal conductivity means that heat will be transferred more slowly.
- Specific heat capacity is a measure of how much heat energy is required to raise the temperature of a substance by a certain amount. Density is a measure of the mass of a substance per unit volume. A substance with a high specific heat capacity and low density will have a higher thermal diffusivity than a substance with a low specific heat capacity and high density.
Applications of thermal diffusivity:
- Thermal diffusivity is an important property in many engineering applications, such as designing heat exchangers, calculating heat transfer rates, and analyzing thermal insulation materials.
- It is used to determine the thermal response of materials to different heating and cooling conditions, which is important in many manufacturing processes.
- Thermal diffusivity is also used in geothermal studies to analyze the thermal conductivity of rocks and soil.
Conclusion:
Thermal diffusivity is an important property that determines the rate at which a substance can conduct heat. It is directly proportional to thermal conductivity and is used in many engineering and scientific applications.
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Thermal diffusivity of a substance is:a)Inversely proportional to thermal conductivityb)Directly proportional to thermal conductivityc)Directly proportional to the square of thermal conductivityd)Inversely proportional to the square of thermal conductivityCorrect answer is option 'B'. Can you explain this answer?
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