If you add sugar to water, it will dissolve and disappear. If you add some more and stir, it too will dissolve and disappear into solution. If you keep adding sugar, eventually your water cannot hold any more in its dissolved form and it will form a precipitate at the bottom. Think sugar sludge left at the bottom of a cup of coffee.
Similarly, air can hold a certain amount of “dissolved” water vapor. The percent of that maximum is your humidity %.
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