A black body can absorb radiation from all wavelengths. As a theoretical concept, a black body absorbs all radiation incident upon it, regardless of the wavelength. This characteristic makes it an ideal absorber and emitter of radiation, which forms the ...
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The water remains cold in the pitcher due to the process of evaporation. As water evaporates from the surface of the pitcher, it absorbs heat energy from the surroundings, including the remaining water, cooling it down.
Steam burns hands more than boiling water because steam contains latent heat. When steam condenses on the skin, it releases this latent heat, transferring more energy to the skin compared to boiling water at the same temperature. This additional heat ...
Running a fan in hot weather gives comfort because our sweat evaporates faster. The moving air increases the evaporation rate of sweat from our skin, which cools the body through the process of evaporative cooling.
When salt is added to water, the boiling point increases and the freezing point decreases. This phenomenon is due to the colligative properties of solutions, where the presence of a solute affects the boiling and freezing points of the solvent.