What is the process of a substance changing into vapor before its boiling point called
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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The process of a substance changing into vapor before its boiling point is known as evaporation. Evaporation occurs at the surface of a liquid when molecules with sufficient kinetic energy escape into the gaseous phase. Unlike boiling, which happens throughout the liquid at a specific temperature (the boiling point), evaporation can occur at any temperature below the boiling point. This process is influenced by factors such as temperature, surface area, humidity, and air movement. For example, water in a puddle evaporates even at room temperature, gradually turning into water vapor. Evaporation is a crucial part of the water cycle, contributing to processes like cooling, weather patterns, and drying of clothes. Therefore, the correct answer is [A] Evaporation. Understanding evaporation helps explain everyday phenomena and is fundamental in various scientific and industrial applications.