The correct answer is [D] Water. Water has the highest specific heat value among the options provided. Specific heat is the amount of heat required to raise the temperature of one unit mass of a substance by one degree Celsius. Water has a specific heat capacity of approximately 4.18 J/g°C, which isRead more
The correct answer is [D] Water. Water has the highest specific heat value among the options provided. Specific heat is the amount of heat required to raise the temperature of one unit mass of a substance by one degree Celsius. Water has a specific heat capacity of approximately 4.18 J/g°C, which is significantly higher than that of glass, copper, or lead. This high specific heat capacity of water is due to its hydrogen bonding and molecular structure, which allows water to absorb and retain heat energy effectively. As a result, water can absorb a large amount of heat without undergoing a significant increase in temperature, making it crucial for regulating temperature in various natural and industrial processes, such as climate moderation, cooking, and thermal energy storage.
The correct answer is [A] Specific heat. Specific heat is the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius. It is a characteristic property of the substance and is used to quantify its ability to store or release thermal energy. Heat cRead more
The correct answer is [A] Specific heat. Specific heat is the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius. It is a characteristic property of the substance and is used to quantify its ability to store or release thermal energy. Heat capacity, on the other hand, refers to the total amount of heat energy required to raise the temperature of an object by one degree Celsius, regardless of its mass. Water equivalent is the mass of water that would absorb or release the same amount of heat as the given substance, while latent heat is the heat absorbed or released during a phase change at constant temperature. Therefore, specific heat specifically addresses the heat required for temperature change per unit mass of a substance.
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.
Which of the following has the highest specific heat value?
The correct answer is [D] Water. Water has the highest specific heat value among the options provided. Specific heat is the amount of heat required to raise the temperature of one unit mass of a substance by one degree Celsius. Water has a specific heat capacity of approximately 4.18 J/g°C, which isRead more
The correct answer is [D] Water. Water has the highest specific heat value among the options provided. Specific heat is the amount of heat required to raise the temperature of one unit mass of a substance by one degree Celsius. Water has a specific heat capacity of approximately 4.18 J/g°C, which is significantly higher than that of glass, copper, or lead. This high specific heat capacity of water is due to its hydrogen bonding and molecular structure, which allows water to absorb and retain heat energy effectively. As a result, water can absorb a large amount of heat without undergoing a significant increase in temperature, making it crucial for regulating temperature in various natural and industrial processes, such as climate moderation, cooking, and thermal energy storage.
See lessThe heat required to raise the temperature of unit mass of a substance by one degree Celsius is
The correct answer is [A] Specific heat. Specific heat is the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius. It is a characteristic property of the substance and is used to quantify its ability to store or release thermal energy. Heat cRead more
The correct answer is [A] Specific heat. Specific heat is the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius. It is a characteristic property of the substance and is used to quantify its ability to store or release thermal energy. Heat capacity, on the other hand, refers to the total amount of heat energy required to raise the temperature of an object by one degree Celsius, regardless of its mass. Water equivalent is the mass of water that would absorb or release the same amount of heat as the given substance, while latent heat is the heat absorbed or released during a phase change at constant temperature. Therefore, specific heat specifically addresses the heat required for temperature change per unit mass of a substance.
See lessBy 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 less