Equilibrium in a sealed bottle of water occurs when evaporation rate equals condensation rate, maintaining a constant water level.
Equilibrium in a sealed bottle half full of water is attained when the rate of evaporation equals the rate of condensation, resulting in no further net change in the water level. When the water vapor density reaches a saturation level due to continuous evaporation, condensation occurs to balance it out. This dynamic process leads to a stable equilibrium within the system.
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