In the method of heat transfer known as radiation, a medium is not necessary. Radiation involves the transfer of heat energy through electromagnetic waves, such as light and infrared radiation, that can travel through a vacuum, such as space. Unlike ...
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The method of heat transmission in which the particles of the medium do not move is conduction. Conduction involves the transfer of heat through direct contact between particles in a material medium.
The best conductor of heat among the options provided is mercury. Mercury is a metal with high thermal conductivity, efficiently transferring heat. In contrast, water, wood, and leather are poor conductors of heat.
The thermal conductivity of silver is greater than that of copper. Silver has a thermal conductivity of approximately 429 watts per meter Kelvin (W/mK), while copper’s thermal conductivity is about 401 W/mK.
A bolometer measures thermal radiation. It detects and quantifies infrared or heat radiation emitted by objects. By monitoring changes in electrical resistance when exposed to thermal radiation, bolometers determine radiation intensity. They are essential in various fields for precise measurement ...
The boiling point of water decreases with increasing altitude. Mussoorie is at a higher altitude than Delhi. Therefore, the boiling point of water in Mussoorie will be less than 100°C.
The normal temperature of a human body is approximately 37 degrees Celsius (°C) when measured orally. This temperature serves as a baseline for assessing an individual’s health. It can vary slightly depending on factors such as age, time of day, ...
Water is used in hot water bags because its specific heat is high, meaning it can absorb and retain a significant amount of heat. This property allows hot water bags to maintain their temperature for extended periods, providing effective warmth ...
Metal tea pots have wooden handles because wood is a poor conductor of heat, preventing the handle from becoming too hot to touch during use. This property ensures user safety by insulating against the heat generated by the hot contents ...
When hot water is sprinkled on a thick glass, the sudden temperature change causes the glass to expand rapidly. This expansion creates stress within the glass, which can exceed its tensile strength, leading to breakage. Therefore, the sudden expansion of ...