gen-briefly-explain-relative-humidity-and-dew-point-and-one-comm-5b6b

Briefly explain relative humidity and dew point and one common misconception about it.

# Relative Humidity and Dew Point **Relative Humidity** is the amount of water vapor actually in the air compared to the maximum amount the air *could* hold at that temperature, expressed as a percentage. At 50% RH, the air contains half the moisture it's capable of holding. **Dew Point** is the temperature to which air must cool for water vapor to condense into liquid (dew, fog, or clouds). Higher dew points mean more moisture in the air. A dew point above 60°F (16°C) feels humid; above 70°F (21°C) feels oppressive. ## Common Misconception **"Warmer air holds more moisture"** - This phrasing suggests air is like a sponge that grabs and holds water molecules. In reality, air doesn't "hold" water at all. Higher temperatures simply allow more water vapor molecules to remain in gaseous form before condensing. It's about the energy and behavior of water molecules themselves, not the air's capacity to contain them. The air is essentially just the space where this happens. This is why relative humidity drops when you heat air (even though moisture content stays the same) - you've increased the temperature threshold before condensation occurs, making the existing moisture a smaller percentage of what's now "possible."