What is condensation?
During condensation, a gaseous substance changes into a liquid state of aggregation. This product is known as condensate.
When does condensation occur?
Condensation occurs when the gas phase is oversaturated with the condensing component. This process begins at the point of condensation. The condensation point indicates the temperature at which a substance condenses at a certain pressure.
What happens with condensation?
When it reaches a certain height, it condenses (it becomes liquid) and ultimately forms clouds – the water vapor becomes visible. The temperature at which the water condenses is also called the dew point. Depending on the relative humidity, the gaseous water condenses.
What is the dew point simply explained?
In general: warm air can absorb much more water or water vapor than cold air. At the dew point, also known as the condensation point, the relative humidity is always 100%, the air is completely saturated with water vapor, ie the air cannot absorb any more water vapor.
What is the dew point temperature?
The dew point describes the temperature of a moist gas mixture in a state of equilibrium in which the condensation and evaporation of the moist component are exactly in balance. How high the saturation vapor pressure is at a given temperature can be seen from the phase diagram of the water resp.
Where should the dew point be?
For mold prevention and mold remediation, it is important that the temperature of the wall on the inside never becomes so cold that the temperature is below the dew point. If the temperature of the wall is always above the dew point, no humidity can condense and the wall remains dry.
Which dew point is good?
In a normally heated apartment, the dew point is around 16 ° C. In addition to regular ventilation, it is important to heat all rooms in a targeted manner. If this does not happen, you have to expect that the outer walls in poorly heated rooms will cool down and fall below the dew point there.
How is the dew point calculated?
One way to measure the dew point temperature is to cool metal until the surface is covered with water vapor. Then the temperature of the metal is the dew point temperature. There is no exact formula for converting the dew point temperature into the relative humidity.
How do you measure the dew point?
The dew point should be measured under real conditions in the room. If you measure it directly after ventilation, the humidity is unrealistically low and the dew point is too high. If components are below the dew point, they are not recognized.
When is the dew point reached?
When the so-called dew point is reached, the relative humidity is 100%, ie the air is completely saturated with water vapor. Every further drop in temperature leads to condensation of water, often on solid objects such as room walls or windows.
What can you read from the dew point curve?
The dew point curve shows that an air parcel with 18 ° C can absorb approx. 16g / m³ of absolute humidity. At the summit, after condensing and raining down, the air package had an absolute humidity of approx. 3.5 g / m³ at an air temperature of -6 ° C.
What is the difference between absolute and relative humidity?
If the humidity is given in percent, it is what is known as the relative humidity. If the values are given in grams, it is the absolute humidity.
What is the relative humidity?
The relative humidity shows immediately to what extent the air is saturated with water vapor: At a relative humidity of 50%, the air contains only half the maximum amount of water vapor that could be contained at the corresponding temperature.
What is meant by absolute humidity?
The air humidity describes the water vapor content in the air. The absolute humidity describes the maximum absorption capacity of the air for steam at a certain temperature. The amount of water vapor in grams that is contained in 1 m³ of air is called the absolute humidity.
What is the normal relative humidity?
The optimal humidity in different living roomsRoomOptimal humidity
When is the humidity too high?
When is the humidity too high? The ideal values for the indoor climate for living spaces are between 40 and 60 percent. In the bathroom and kitchen, the moisture content of the air can be slightly higher. If the humidity is above this percentage, it is too high.
When is the relative humidity higher in summer or winter?
Because the humidity is much higher in summer than in winter. When warm, humid air meets cooler areas indoors, the temperature falls below the dew point and condensate forms. “Especially in summer, the relationship between temperature and humidity, especially in the basement, is ideal for mold growth.
When is humidity high?
High humidity in the apartment In living rooms, 60% humidity is the upper limit, while 70% can be reached in the bathroom. However, if you sleep with the window closed, you have already exceeded the limit value in the bedroom with 60% humidity.
What is the normal humidity outside?
So that it doesn’t even get that far, the hygrometer should be used to measure the relative humidity. The ideal value at which we feel most comfortable is 50 percent. This applies to both the living area and outside.
What does high humidity do?
Causes of high humidity. However, cold air can hold less water than warm air, so that with the same absolute amount of humidity, the (relative) humidity increases and quickly takes on values above 60%. But even if the temperature remains the same, the humidity increases throughout the day.
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