![]() ![]() The next time you want to complain about the humidity, redirect that frustration to the true measure of moisture. With a dew point of 78 ☏, you practically need gills to breath in that air. At 100 ☏, you can have relative humidity as low as 50%, but it’s still going to be downright oppressive. The hotter it gets, the lower the humidity needs to be to start a riot. Even though we’re close to saturated, the moisture content of the air is pretty low. ![]() Problem: The goal of these experiments is to learn about condensation. The lower the temperature, the more humid it can be while still being rather comfortable.Īt 50 ☏, 90% humidity still isn’t “humid” enough for griping because the dew point is only 47 ☏. Since the dew point is higher when the air is moist, it is a rough measure of humidity. The National Weather Service defines dew point as the temperature to which air must be cooled to in order to reach saturation, assuming air pressure and moisture content are constant. A relative humidity of 100 indicates the dew point is equal to the current temperature and that the air is maximally saturated with water. ![]() We can visualize this with a plot of dew point based on the temperature and humidity. It gives us an idea of how close the temperature is to the dew point, but it doesn’t directly represent the amount of moisture present. Humidity is a measure of how saturated the air is. It’s the temperature that the air must be cooled to in order to reach saturation. Let’s establish some definitions.ĭew point is a measure of how much moisture is in the air. As air temperature changes the Dew Point tends to remain constant unless water is added or removed from the air. I say we should cut humidity a break, because it turns out, what we’re really complaining about is the dew point. The Dew Point temperature is always lower than the Dry Bulb temperature and will be identical with 100 relative humidity (the air is at the saturation line). Compared to relative humidity, dew point is frequently cited as a more accurate way of measuring the humidity and comfort of the air, since it is an absolute measurement (unlike relative. On a sweltering summer day, humidity becomes public enemy number one. ![]()
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