Railways Exam > Railways Questions > Thermal conductivity is defined as?a)Heat fl...
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Thermal conductivity is defined as?
- a)Heat flow per unit time when the temperature gradient is unity
- b)Heat flow per unit time which flows through wall whose thickness is unity
- c)Heat flow per unit time through a wall with no temperature
- d)Heat flow per unit time across the unit area, wherein the temperature gradient is unity.
Correct answer is option 'D'. Can you explain this answer?
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Thermal conductivity is defined as?a)Heat flow per unit time when the...
Thermal conductivity is defined as Heat flow per unit time across the unit area, wherein the temperature gradient is unity. Every material has thermal conductivity due to the movement of free electrons and vibrational waves across the lattice structure.
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Thermal conductivity is defined as?a)Heat flow per unit time when the...
Thermal conductivity is defined as:
Answer: Option D - Heat flow per unit time across the unit area, wherein the temperature gradient is unity.
Explanation:
Thermal conductivity is a fundamental property of a material that describes its ability to conduct heat. It is defined as the amount of heat energy transferred through a material per unit time and per unit area, when there is a unit temperature gradient (i.e., a temperature difference) across the material.
Heat flow:
Heat flow refers to the transfer of thermal energy from a region of higher temperature to a region of lower temperature. It occurs due to the random motion of molecules and is driven by the temperature difference between the two regions.
Unit time:
Unit time refers to a specific interval of time, often taken as one second, which is used as a standard for measuring the rate at which a process or event occurs.
Unit area:
Unit area refers to a standard area measurement, often taken as one square meter, which is used as a reference for calculating rates or densities.
Temperature gradient:
Temperature gradient refers to the rate at which the temperature changes over a given distance. It is calculated by dividing the change in temperature by the distance over which the change occurs.
Combining the above concepts:
Thermal conductivity is defined as the heat flow per unit time across a unit area, when there is a unit temperature gradient. This means that it quantifies the amount of heat energy that can be transferred through a material in a specific amount of time, per unit area, when there is a specific temperature difference across the material.
The thermal conductivity of a material is an important property for various applications, as it determines how well the material can conduct heat. Materials with high thermal conductivity, such as metals, are good conductors of heat, while materials with low thermal conductivity, such as insulators, are poor conductors of heat. Understanding the thermal conductivity of materials is crucial in designing efficient heat transfer systems and optimizing energy usage.
In summary, thermal conductivity is defined as the heat flow per unit time across the unit area, wherein the temperature gradient is unity.
Answer: Option D - Heat flow per unit time across the unit area, wherein the temperature gradient is unity.
Explanation:
Thermal conductivity is a fundamental property of a material that describes its ability to conduct heat. It is defined as the amount of heat energy transferred through a material per unit time and per unit area, when there is a unit temperature gradient (i.e., a temperature difference) across the material.
Heat flow:
Heat flow refers to the transfer of thermal energy from a region of higher temperature to a region of lower temperature. It occurs due to the random motion of molecules and is driven by the temperature difference between the two regions.
Unit time:
Unit time refers to a specific interval of time, often taken as one second, which is used as a standard for measuring the rate at which a process or event occurs.
Unit area:
Unit area refers to a standard area measurement, often taken as one square meter, which is used as a reference for calculating rates or densities.
Temperature gradient:
Temperature gradient refers to the rate at which the temperature changes over a given distance. It is calculated by dividing the change in temperature by the distance over which the change occurs.
Combining the above concepts:
Thermal conductivity is defined as the heat flow per unit time across a unit area, when there is a unit temperature gradient. This means that it quantifies the amount of heat energy that can be transferred through a material in a specific amount of time, per unit area, when there is a specific temperature difference across the material.
The thermal conductivity of a material is an important property for various applications, as it determines how well the material can conduct heat. Materials with high thermal conductivity, such as metals, are good conductors of heat, while materials with low thermal conductivity, such as insulators, are poor conductors of heat. Understanding the thermal conductivity of materials is crucial in designing efficient heat transfer systems and optimizing energy usage.
In summary, thermal conductivity is defined as the heat flow per unit time across the unit area, wherein the temperature gradient is unity.
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Thermal conductivity is defined as?a)Heat flow per unit time when the temperature gradient is unityb)Heat flow per unit time which flows through wall whose thickness is unityc)Heat flow per unit time through a wall with no temperatured)Heat flow per unit time across the unit area, wherein the temperature gradient is unity.Correct answer is option 'D'. Can you explain this answer?
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Thermal conductivity is defined as?a)Heat flow per unit time when the temperature gradient is unityb)Heat flow per unit time which flows through wall whose thickness is unityc)Heat flow per unit time through a wall with no temperatured)Heat flow per unit time across the unit area, wherein the temperature gradient is unity.Correct answer is option 'D'. Can you explain this answer? for Railways 2024 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about Thermal conductivity is defined as?a)Heat flow per unit time when the temperature gradient is unityb)Heat flow per unit time which flows through wall whose thickness is unityc)Heat flow per unit time through a wall with no temperatured)Heat flow per unit time across the unit area, wherein the temperature gradient is unity.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Railways 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Thermal conductivity is defined as?a)Heat flow per unit time when the temperature gradient is unityb)Heat flow per unit time which flows through wall whose thickness is unityc)Heat flow per unit time through a wall with no temperatured)Heat flow per unit time across the unit area, wherein the temperature gradient is unity.Correct answer is option 'D'. Can you explain this answer?.
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