What is evaporation and how does it occur in liquids?

Evaporation is the process where particles at the surface of a liquid gain enough energy to escape into the air as gas. This occurs because the particles at the surface have higher kinetic energy compared to those in the bulk of the liquid, allowing them to overcome intermolecular forces.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: What is evaporation and how does it occur in liquids. The correct response is Evaporation is the process where particles at the surface of a liquid gain enough energy to escape into the air as gas. This occurs because the particles at the surface have higher kinetic energy compared to those in the bulk of the liquid, allowing them to overcome intermolecular forces., because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to explain evaporation as particles escaping from the surface of a liquid. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Changes of state and the particle model, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 147 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.