The process of a substance changing into vapor before its boiling point is called evaporation. Evaporation occurs at the surface of a liquid at temperatures below the boiling point, driven by the escape of high-energy molecules into the air.
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Man feels discomfort due to humidity because sweat does not evaporate efficiently in high humidity. Evaporation of sweat cools the body, and when humidity is high, this process is hindered, leading to overheating and discomfort.
Rice cooks quickly in a pressure cooker because high pressure increases the boiling point of water. This elevated boiling point allows the water to reach higher temperatures, cooking the rice more rapidly. Therefore, the correct answer is [B] High pressure ...
When a piece of ice floating in a glass of water completely melts, the level of water in the glass remains unchanged. This is because the volume of water displaced by the ice is equal to the volume of water ...
Skating on ice shows that on increasing the pressure, the melting point of ice decreases. The pressure exerted by the skater lowers the melting point of the ice underneath the skate blades, causing a thin layer of ice to melt, ...