The complete air pressure exerted by a volume of wait in a given container on that container is the amount of the individual (partial) pressures of these gases.The vapor pressure is the separation, personal, instance or partial press of the water vapor.

You are watching: When the air is fully saturated what is reached

The warmer the wait is, the an ext moisture it have the right to hold. For this reason its moisture holding capacity changes with temperature.

A Psychometric chart (pictured below) represents the moisture contents of waiting at various temperatures. This chart mirrors that as the wait temperature increases, the quantity of moisture that can be hosted in dry air also increases.

Dry bulb temperature: Temperature with no moisture in the air; recognized as “absolute air.”Dew point Temperature: finish saturation – the maximum quantity of water vapor that air have the right to hold. Note that water vapor deserve to carry an ext heat than air.

Psychometric Chart

As we know, varying quantities of humidity (in the gas or vapor form) exist in the air. Absolute Humidity is the actual lot of moisture the is contained in air. It is stood for in the formula below:

AbsoluteHumidity= MassofWaterVapor(lb) MassofDryAir(lb)

Relative humidity, in contrast, is the proportion of the amount of humidity in the air come the maximum quantity of moisture the air have the right to hold in ~ a provided temperature. The is stood for in the formula below:


Example 1

Calculate the relative humidity that air once the air includes 0.002 lb of humidity per pound of dried air if the maximum humidity air have the right to hold at the temperature is 0.005 lb every lb of dry air.

RelativeHumidity= lbofmoistureperlbofdryair Max.lbof moisture perlbofdryairatthattemp.

= 0.002lb lb of dry air ( 0.005lb lb of dried air )at the temp. ×100=40%

Air is claimed to it is in saturated once the amount of water vapor in the waiting is the maximum possible at an currently temperature and also pressure.

Air is stated to be saturated at 100 percent relative humidity when it includes the maximum amount of moisture possible at that particular temperature.Air holding half the maximum quantity of humidity at a given temperature has actually a relative humidity that 50 percent.

When loved one humidity will 100 percent or is saturated, moisture will certainly condense, definition the water vapor changes to liquid vapor.

Thus, the saturation level of waiting is regarded the air"s temperature. Together air temperature increases (or becomes warmer), more water remains in a gas phase. Together temperature decreases (or becomes colder), the water molecules slow down and also it is more likely the they will certainly condense onto nearby surfaces.

Dew Point is the temperature at which wait reaches 100 percent loved one humidity. If the waiting is cooled listed below dew point, moisture in the wait condenses.

Moisture will condense top top a surface whose temperature is below the dew allude temperature the the air beside it. Because that air at a given absolute humidity, the colder the surface, the higher the family member humidity alongside that surface. For this reason the coldest surface in a room is the location where condensation will most likely occur very first (called the very first condensing surface).


Saturation is the maximum lot of water vapor in the air in ~ an currently temperature and also pressure. Air is stated to be saturated at 100 percent family member humidity when it consists of the maximum quantity of moisture possible at that details temperature.

Dew point is the temperature when air will 100% family member humidity.

See more: Which Large Vessel Transports Absorbed Nutrients To The Liver? ?

Humidity and also Condensation

A basement v a window leading outside at ground level includes normal, cool air. As soon as the home window is opened on a summer day, warm, moisture-rich wait enters the basement and mixes with the cool air. This causes a buildup of humidity on the walls and also floor, and also the remainder of the basement surfaces.


1) which air has actually the many amount of moisture?

Warm external airCool within airCombined inside and outside air

2) ~ the warm external air mixes v the cool inside air, what happens?


3) In the animation, i beg your pardon of the complying with is the an initial condensing surface?

Walls and also floorGroundWindow

4) The temperature of the an initial condensing surface ar is: