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I constantly am hearing the popular myth that electric baseboard heaters "burn off the oxygen" and dry out houses, and that percent (a reasonable figure for a cold climate) can have entirely different readings of health and comfort. This is because cup gets bigger. The relationships between temperature, water vapor and relative humidity are plotted on a graph called the psychrometric chart—a chart so complex it could drive you to the psychiatrist, although I don't think that's how it got its name. A block of air is much like a sponge. If you put it into contact with water, it will soak up water only to a certain point. If you keep adding water until you