Boiling needs _.
Correct answer: B. Supply of heat constantly
- A. Supply of heat in the start
- B. Supply of heat constantly
- C. Supply of heat at the end
- D. Supply of heat variably
Explanation
Boiling needs a continuous and constant heat supply. As a liquid is heated, the kinetic energy of its molecules increases, and hence the temperature also increases. At the boiling point, the kinetic energy of the molecules becomes maximum and any further heating at this stage will not increase the temperature. If the heat supply cuts before the boiling point is reached, the kinetic energy of the liquid molecules starts to decrease.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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