What happens to the air at 100% humidity?

When the humidity reaches 100%, no more water can be dissolved in the air. Any further moisture will precipitate out as fog or rain. Also if you take air at a given temp, that is at 100% humidity, and drop the temp, the water precipitates out as fog. This is what's referred to as the dew point.

100 Humidity

It looks like you already know a lot about our atmosphere and the condensation of water. Let's take an example: A cubic meter of air at 15 C that contains 13 grams of water. Its absolute humidity is 13 gr / m3 and its relative humidity is 100 percent. Its dew point temperature is also 13 C.

Okay, now we sink the temperature of that cubic meter of air by lifting it upward, in an atmosphere with lesser pressure. The resulting expansion of the air creates an adiabatic cooling. The cubic meter's temperature falls to say, 12 C. What happens?

... not much. The parcel of air must get rid of some of the water in gaseous form by condensing it in liquid form. But that requires giving away energy in form of heat and the tiny water molecules don't have enough mass to absorb that energy. It is only when they touch just anything like a particle of dust or smoke ... or the bonnet of your car, for the matter! ... that it can dissipate the heat energy and condense. This is why dew appears as temperature sinks early in the morning!

If that parcel of air keeps rising because it is a convection of warm rising air as it happens on the warm front of a low pressure, then the process of condensing into droplets continues. That is how clouds are formed and, if it keeps rising and the condensation continues, the droplets will get so big that they will eventually overcome the rising by gravitation and fall as rain. If the rising is strong enough, they will get so high that they will freeze into pellets of ice. This is when we get hail.

But rain and snow always happens first upward! Strange, isn't it? Actually a cloud that doesn't rise in altitude is a cloud that disappears because clouds evaporate. Yes, even ice and snow does. When it happens, it is called, sublimation.

Air at 100% humidity is totally saturated. Either it will form dew, which is the most likely, fog will form, or it is raining. 100% humidity is the saturation point. This is when the dew-point and the temperature are the same, hence the 100% RELATIVE Humidity.

it is going to rain, snow, or dew will variety on surfaces that are even a sprint cooler. whilst your chilly glass is omitted on a heat day, the air around it drops in temperature. whilst the relative humidity reaches one hundred%, then the air drops it rather is moisture, leaving water droplets on the glass. undergo in suggestions, relative humidity is, nicely, relative to temperature. you are able to advance the relative humidity by making use of reducing temperature, or including moisture.

At 100% humidity I've always assumed it was raining. 100% would be really wet. . .and I think they do call that rain. I live where the humidity is very high all the time but not enough to rain. It makes hot much more uncomfortable and I sweat like a pig. I've done my best to avoid anything cold.