The correct answer is [C] Radiation. The walls of a thermos flask are designed to minimize heat transfer by radiation through galvanization, which involves coating the inner surfaces with a reflective material, often aluminum or a similar substance. This shiny coating reflects infrared radiation bacRead more
The correct answer is [C] Radiation. The walls of a thermos flask are designed to minimize heat transfer by radiation through galvanization, which involves coating the inner surfaces with a reflective material, often aluminum or a similar substance. This shiny coating reflects infrared radiation back into the liquid, thereby reducing heat loss through radiative transfer. While the vacuum between the flask’s double walls effectively eliminates heat transfer by conduction and convection, it is the reflective inner surface that specifically targets radiation. This reflective layer ensures that the heat is kept within the flask when the contents are hot, or that external heat is reflected away when the contents are cold. This comprehensive approach is what makes a thermos flask so effective at maintaining the temperature of its contents for long periods. Thus, galvanization primarily addresses heat transfer by radiation, making it a critical component of the thermos flask’s design.
The correct answer is [C] The double walls of the shiny inner wall and the outer cover prevent heat from escaping or entering. A thermos flask is designed to minimize heat transfer and maintain the temperature of its contents. The key feature is the vacuum between the double walls, which effectivelyRead more
The correct answer is [C] The double walls of the shiny inner wall and the outer cover prevent heat from escaping or entering. A thermos flask is designed to minimize heat transfer and maintain the temperature of its contents. The key feature is the vacuum between the double walls, which effectively prevents heat transfer by conduction and convection since there are no molecules in the vacuum to transfer heat. Additionally, the inner walls are shiny and reflective, which reduces heat loss through radiation by reflecting infrared radiation back into the liquid. The outer cover adds an extra layer of insulation, further minimizing any potential heat exchange with the external environment. Together, these design elements work synergistically to ensure that the liquid inside the flask remains hot or cold for an extended period, making the thermos flask an efficient and practical solution for temperature maintenance.
The correct answer is [B] To prevent heat loss due to radiation. The shiny inner walls of a thermos flask are designed to reflect infrared radiation, which is a form of heat transfer. By having a reflective surface, the flask minimizes the amount of heat that can escape through radiation. This is crRead more
The correct answer is [B] To prevent heat loss due to radiation. The shiny inner walls of a thermos flask are designed to reflect infrared radiation, which is a form of heat transfer. By having a reflective surface, the flask minimizes the amount of heat that can escape through radiation. This is crucial because, even with a vacuum between the inner and outer walls to prevent conduction and convection, radiation can still occur. The reflective coating typically made of materials like aluminum, bounces the infrared rays back into the liquid, thereby maintaining its temperature. This design effectively traps heat inside the flask if the contents are hot or prevents external heat from entering if the contents are cold. This comprehensive approach to reducing heat loss ensures that the thermos flask can keep beverages at their desired temperature for extended periods, making it highly efficient and practical for everyday use.
The correct answer is [D] Conduction, convection, and radiation. A thermos flask is designed to minimize heat loss through all three mechanisms. The vacuum between the inner and outer walls of the flask effectively prevents heat transfer by conduction and convection. Since there is no medium for theRead more
The correct answer is [D] Conduction, convection, and radiation. A thermos flask is designed to minimize heat loss through all three mechanisms. The vacuum between the inner and outer walls of the flask effectively prevents heat transfer by conduction and convection. Since there is no medium for these processes to occur in the vacuum, they are significantly reduced. To tackle heat loss through radiation, the inner surfaces of the flask are usually coated with a reflective material like aluminum. This reflective coating helps to reflect infrared radiation back into the liquid, maintaining its temperature. The combination of these features ensures that the thermos flask is highly efficient at keeping its contents hot or cold for extended periods. By addressing all three methods of heat transfer, the thermos flask exemplifies a practical application of thermal insulation principles, making it an essential tool for preserving the temperature of liquids.
The correct answer is [A] Dewar. Sir James Dewar, a Scottish scientist, is credited with inventing the Thermos flask in 1892. Dewar was a chemist and physicist known for his work in cryogenics and the study of low-temperature phenomena. He created the vacuum flask, or Dewar flask, as part of his resRead more
The correct answer is [A] Dewar. Sir James Dewar, a Scottish scientist, is credited with inventing the Thermos flask in 1892. Dewar was a chemist and physicist known for his work in cryogenics and the study of low-temperature phenomena. He created the vacuum flask, or Dewar flask, as part of his research on the liquefaction of gases. The design involved placing one glass bottle inside another and evacuating the air between them, creating a vacuum that significantly reduced heat transfer by conduction and convection. This innovation was essential for maintaining substances at stable temperatures for extended periods. Although Dewar invented the flask, he did not patent it. Later, the German company Thermos GmbH commercialized the design, leading to the product being commonly known as the Thermos flask. The invention has since become a staple in both scientific laboratories and everyday use for keeping liquids hot or cold.
By which method are the walls of a thermos flask galvanized to minimize heat transfer?
The correct answer is [C] Radiation. The walls of a thermos flask are designed to minimize heat transfer by radiation through galvanization, which involves coating the inner surfaces with a reflective material, often aluminum or a similar substance. This shiny coating reflects infrared radiation bacRead more
The correct answer is [C] Radiation. The walls of a thermos flask are designed to minimize heat transfer by radiation through galvanization, which involves coating the inner surfaces with a reflective material, often aluminum or a similar substance. This shiny coating reflects infrared radiation back into the liquid, thereby reducing heat loss through radiative transfer. While the vacuum between the flask’s double walls effectively eliminates heat transfer by conduction and convection, it is the reflective inner surface that specifically targets radiation. This reflective layer ensures that the heat is kept within the flask when the contents are hot, or that external heat is reflected away when the contents are cold. This comprehensive approach is what makes a thermos flask so effective at maintaining the temperature of its contents for long periods. Thus, galvanization primarily addresses heat transfer by radiation, making it a critical component of the thermos flask’s design.
See lessThermos flask keeps liquids hot for a long time because
The correct answer is [C] The double walls of the shiny inner wall and the outer cover prevent heat from escaping or entering. A thermos flask is designed to minimize heat transfer and maintain the temperature of its contents. The key feature is the vacuum between the double walls, which effectivelyRead more
The correct answer is [C] The double walls of the shiny inner wall and the outer cover prevent heat from escaping or entering. A thermos flask is designed to minimize heat transfer and maintain the temperature of its contents. The key feature is the vacuum between the double walls, which effectively prevents heat transfer by conduction and convection since there are no molecules in the vacuum to transfer heat. Additionally, the inner walls are shiny and reflective, which reduces heat loss through radiation by reflecting infrared radiation back into the liquid. The outer cover adds an extra layer of insulation, further minimizing any potential heat exchange with the external environment. Together, these design elements work synergistically to ensure that the liquid inside the flask remains hot or cold for an extended period, making the thermos flask an efficient and practical solution for temperature maintenance.
See lessThe inner walls of a thermos flask are shiny because
The correct answer is [B] To prevent heat loss due to radiation. The shiny inner walls of a thermos flask are designed to reflect infrared radiation, which is a form of heat transfer. By having a reflective surface, the flask minimizes the amount of heat that can escape through radiation. This is crRead more
The correct answer is [B] To prevent heat loss due to radiation. The shiny inner walls of a thermos flask are designed to reflect infrared radiation, which is a form of heat transfer. By having a reflective surface, the flask minimizes the amount of heat that can escape through radiation. This is crucial because, even with a vacuum between the inner and outer walls to prevent conduction and convection, radiation can still occur. The reflective coating typically made of materials like aluminum, bounces the infrared rays back into the liquid, thereby maintaining its temperature. This design effectively traps heat inside the flask if the contents are hot or prevents external heat from entering if the contents are cold. This comprehensive approach to reducing heat loss ensures that the thermos flask can keep beverages at their desired temperature for extended periods, making it highly efficient and practical for everyday use.
See lessHeat loss in a thermos flask can be prevented by
The correct answer is [D] Conduction, convection, and radiation. A thermos flask is designed to minimize heat loss through all three mechanisms. The vacuum between the inner and outer walls of the flask effectively prevents heat transfer by conduction and convection. Since there is no medium for theRead more
The correct answer is [D] Conduction, convection, and radiation. A thermos flask is designed to minimize heat loss through all three mechanisms. The vacuum between the inner and outer walls of the flask effectively prevents heat transfer by conduction and convection. Since there is no medium for these processes to occur in the vacuum, they are significantly reduced. To tackle heat loss through radiation, the inner surfaces of the flask are usually coated with a reflective material like aluminum. This reflective coating helps to reflect infrared radiation back into the liquid, maintaining its temperature. The combination of these features ensures that the thermos flask is highly efficient at keeping its contents hot or cold for extended periods. By addressing all three methods of heat transfer, the thermos flask exemplifies a practical application of thermal insulation principles, making it an essential tool for preserving the temperature of liquids.
See lessThe inventor of Thermos Flask is
The correct answer is [A] Dewar. Sir James Dewar, a Scottish scientist, is credited with inventing the Thermos flask in 1892. Dewar was a chemist and physicist known for his work in cryogenics and the study of low-temperature phenomena. He created the vacuum flask, or Dewar flask, as part of his resRead more
The correct answer is [A] Dewar. Sir James Dewar, a Scottish scientist, is credited with inventing the Thermos flask in 1892. Dewar was a chemist and physicist known for his work in cryogenics and the study of low-temperature phenomena. He created the vacuum flask, or Dewar flask, as part of his research on the liquefaction of gases. The design involved placing one glass bottle inside another and evacuating the air between them, creating a vacuum that significantly reduced heat transfer by conduction and convection. This innovation was essential for maintaining substances at stable temperatures for extended periods. Although Dewar invented the flask, he did not patent it. Later, the German company Thermos GmbH commercialized the design, leading to the product being commonly known as the Thermos flask. The invention has since become a staple in both scientific laboratories and everyday use for keeping liquids hot or cold.
See less