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It's even worse than that. Under some conditions, there can be solid, liquid and gaseous water all in equilibrium at the same time!
You might look up "Partial Pressures" of liquids. Essentially all liquids exert a certain force of evaporation based on the temperature and pressure.Say you have a sealed partly full water bottle (with air above it). The air above the water will reach an equilibrium with a percent of vapor based on the temperature and pressure of the container.