Relative Humidity Doesn’t Tell You How Humid the Air Is

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There’s a problem with relative humidity. I hear it a lot when I talk to people about moisture problems. A client with high humidity in his home recently told me he didn’t understand how it could be more humid inside his home than it was outdoors. The indoor relative humidity (RH) was 60% while it was only 50% outdoors. Do you see the problem?

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[source: http://www.greenbuildingadvisor.com/articles/dept/building-science/relative-humidity-doesn-t-tell-you-how-humid-air]