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• Relative Humidity.
• The mean monthly humidity is summarized in the following table for four stations in and around the area. Relative humidity is uniformly high and its annual mean ranges from 70% to 80%. Monthly mean relative humidity. The seasonal variation of relative humidity is almost conformable to the rainfall pattern of the area. Usually, the higher relative humidity is observed in the rainy season from May to October and the lower in the dry season from November to April. ...

• Specific Humidity or Moisture Content of Air.
• Specific humidity or moisture content of air is the ratio of the mass of water to the mass of dry air in a given volume of moist air. ...

• Synopsis:  Wood shrinks and swells with humidity changes, and this can damage your guitar. ...
• Probably the single most exasperating problem in caring for a high quality guitar is the tendency of the wood to shrink or expand with changes in humidity.   Many expensive repairs could be avoided by understanding the effects of humidity change and by applying simple remedies available for dealing with them.
•   Solid woods, however, are more vulnerable to humidity change because they shrink and expand much more than plywood.
• When humidity is very high, a guitar may sound, for want of a better word, "soggy. ...   It is also possible for a guitar to suffer structural damage when humidity is very high. ...   Another problem that can be caused by extreme humidity, as in tropical areas or a very damp basement, is deterioration of the glue and potentially even the wood itself.
• The effects of very low humidity, which is a more common problem in temperate regions of the world, are often even more serious. ...
• The key concept in understanding humidity is what meteorologists call "relative humidity. ...   Relative humidity is the amount of moisture present in the air expressed as a percentage of the total moisture the air is capable of holding at that particular temperature.   It is humidity relative to temperature. If the relative humidity is 40%, then the air, if maintained at a constant temperature, will theoretically hold 59. ...   As the relative humidity rises, the air takes on additional moisture more and more slowly.   When relative humidity drops, the air accepts moisture more rapidly.
• When relative humidity is very low, things (like guitars!) dry out fast.
• There are a few places in the world, like parts of the American Southwest or other desert regions, where the normal everyday humidity may be low enough to be hazardous for a guitar.   However, low relative humidity starts to become a problem anywhere whenever buildings are heated.   If the temperature outdoors is 20 degrees Fahrenheit, the relative humidity 50%, and we take this air inside and heat it to 70 degrees, then the relative humidity can drop to 30% or less. The colder it gets outside, the more the relative humidity drops inside.

• On a warm summer day when the relative humidity (RH) starts to climb, the surface conductivities of insulating materials such as NylonTM, PVC, and PlexiglasTM, etc. ...
• When the relative humidity is between 60% and 70%, and the temperature is not too high, there are a few simple measures that can be taken to combat the effects of humidity.
• A rather handy accessory is a small, battery-operated humidity meter. ...
• As temperature and humidity rise, all of these measures inevitably begin to lose their effectiveness; therefore, the serious hobbyist or lecture demonstrator will need to experiment with various countermeasures to find the ones most effective for a given apparatus and given set of conditions. ...
• What humidity does is to increase the adsorption of water on to the surface of insulators (such as glass or plastics) and the absorption into many other materials. ... Paper is an example of a very common material that is highly susceptible to the effects of humidity. ... The graph below shows the influence of relative humidity on bond paper at room temperature. ...
• One approach to the problem of humidity, suitable for laboratory demonstrations though perhaps not so convenient for the lecture hall, is to store all the equipment in a heated enclosure. The air within the enclosure, warmed to about 10 deg C above ambient, has reduced relative humidity; and this measure is usually sufficient to control surface conduction on insulating materials. ...
• Though few electrostatics demonstrators will ever be heard to complain about low humidity conditions, there are certain demonstrations where problems can arise in very dry weather. ...
• McGrath, "Electrostatics demonstrations at high relative humidity," Am. ...

•  Humidity.
• Expressing Humidity.
• How do we describe the humidity of the air?  Here are several ways to express humidity, including everyone's favorite, relative humidity.   Also, a brief discussion of the relationship between humidity and temperature.

• relative humidity—The ratio of the vapor pressure to the saturation vapor pressure with respect to water. ... Relative humidity is usually expressed in percent and can be computed from psychrometric data. Unless specified otherwise, relative humidity is reported with respect to water rather than ice because most hygrometers are sensitive to relative humidity with respect to water even at subfreezing temperatures, and because the air can easily become supersaturated with respect to ice, which would require three digits in coded messages for relative humidity with respect to ice. ...

• A calculation of relative humidity with a change of temperature using a Java applet. ...
• Enter the first temperature and relative humidity, along with the second temperature, below. Press the calculate button, and the relative humidity at the second temperature is displayed. The absolute humidity (measured in mm Hg) is also displayed, along with the dew point (the temperature at which the relative humidity is 100%).
• Knowing the saturated water vapor pressure, which is only dependent upon temperature, the absolute water vapor pressure is calculated directly using the relative humidity. To calculate the relative humidity at a second temperature, the saturated water vapor pressure is again calculated, and the original absolute vapor is divided by this number. ...
• To calculate the dewpoint, the Clausius-Clapeyron equation is solved for temperature, and the absolute humidity is used as the independent variable.

• Relative Humidity.
• Relative humidity is the most commonly used measure of atmospheric moisture. Relative humidity is the ratio of the actual amount of moisture in the air to the amount of moisture that the air could hold if saturated at that temperature. ... Large daily changes in relative humidity can take place without any change in absolute moisture content of the air. For example, 100 percent relative humidity at a temperature of 65 degrees during the early morning hours will drop to about 46 percent in the afternoon if the air temperature rises to 95 degrees. Because of this temperature influence, relative humidity is lowest during the warmest portion of the day and highest during the coolest hours of night and very early morning.
• Comparison of average relative humidity data at six-hour intervals in Table 8 shows that the eastern areas of the state are more humid than the western areas. ... relative humidity for the year at Fargo and Devils Lake is 62 and 63 percent, respectively, while at Bismarck and Williston the average relative humidity is only 53 and 54 percent, respectively. In some late summer and fall months, the relative humidity at 6:00 p. ... Notice also in Table 8 that relative humidity is higher at midnight and 6:00 a. ... the relative humidity is much lower in summer than in winter. ...
• Average realtive humidity by month and for year at hour indicated at four locations in North Dakota. ...

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• Humidity Control.
• How does humidity level affect my piano's tuning? .
• What is relative humidity? .
• What can be done to minimize humidity problems? .
• How will humidity control benefit my piano? .
• However, being made of wood, your piano is greatly affected by humidity. Seasonal and even daily changes in humidity cause wood parts to swell and shrink, affecting tuning stability and touch. Extreme swings in humidity can eventually cause wood to crack and glue joints to fail. ...
• Very high humidity can even create condensation on metal parts such as strings, tuning pins and hardware, eventually causing them to rust. ...
• How does humidity level affect my piano's tuning?.
• Swelling and shrinking of the piano's soundboard is the most immediate and noticeable effect of humidity change. ...
• As the moisture level in the soundboard increases during periods of high relative humidity, the crown expands and pushes the bridge harder against the strings. ...
• During periods of low relative humidity the soundboard shrinks, reducing the crown and decreasing pressure against the strings. ... When relative humidity returns to its previous level, the average pitch of all the strings will return to normal, although the exact pitch of individual strings will be slightly changed from their original settings. Thus, a piano only will stay in tune as long as the relative humidity level in the air surrounding the soundboard remains constant. Extreme humidity changes require making greater changes in string tension to bring the piano into tune. ...

• LEARNING ABOUT HUMIDITY IN THERMAL COMFORT.
• ) and architects a technical topic of importance in the practice of architecture such as the influence of humidity on human thermal comfort. To evaluate the contribution of humidity, Fanger's PMV treatment (ISO7730) is recommended only for water vapour pressures under 2700 Pa. ...
• A study of Fanger's formulation shows that an increase in relative humidity is ALWAYS perceived as a warmer sensation. ...
• So, we begin from classical thermodynamics and, pointing out CLEARLY the approximations done, we finish at actual applications of the humidity concepts.
• We have used this method to obtain, in a reasoned way, the contributions of humidity to Fanger's formulation of PMV. ...
• In dry climates at the hot station, humidity is a great help for extracting heat of the ambience.
• - High humidity make the hot and cool sensations worse .
• - Low humidity dissect the nasal mucouses,.
• In this way, absolute humidity is defined by the mass of water vapour (usually in grams) contained in a given quantity of dry air (usually kilograms). ...
• The quotient, in per cent, between vapour pressure and saturation pressure is called relative humidity. ...
• This way, if we want to know the energetic exchange between two different states of the air, we can decompose it in two components: a change in the air temperature (sensible heat exchange) and a change in the humidity contents (latent heat exchange). ...
• It can obstruct solar radiation, change wind's speed and direction, affects the radiant exchange between the soil and the space, modifies the ambience temperature and, obviously, modifies the humidity of the air.
• Although effects on radiation and wind are more evident (Ochoa 1998), variations in humidity and temperature can also be appreciated, mainly when talking about big landscaped areas and, even more, in zones confined by topographic or architectural barriers.
• The mechanism that vegetation employs to modify temperature and humidity is called evapotranspiration, that is the evaporation of the water, leaked by plants, through their estomes of its leafs and stems. It is called evaporative cooling, which depends mainly on two factors: the quantity of leaked water and the relative humidity of the air.

• Relative Humidity. ...
• Humidity is a complicated concept. Humidity refers to water vapor in the air and for years relative humidity has been what meteorologists use to inform the TV audience about how humid it is. There is much misunderstanding about humidity in general and relative humidity in particular. ... First when thinking about humidity - THINK ENERGY!.
• Humidity - The amount of water vapor in the air. This has nothing to do with rain drops or fog or any other form of liquid or solid water in the atmosphere, it is the air space between the rain drops and how much vapor that exists there that determines the humidity. ... HUMIDITY MYTHS.
• When thinking of humidity always think in terms of energy. ...
• There is a connection between humidity and air temperature, but the connection has nothing to do with air "holding" water vapor. ...
• Relative humidity expresses how much of the available energy has been used to "free" liquid water molecules. A relative humidity of 50% means half the available energy has been used to evaporate water from the ground, streams, lakes anywhere else it is and 50% is still available to do more evaporation. ...
• On a summer morning the temperature may be 75°F and the relative humidity 90%, a very sticky morning indeed. Without changing the amount of water vapor in the air if the temperature hits 92°F in the afternoon the relative humidity drops to 52%. Relative humidity is RELATIVE TO THE AMOUNT OF ENERGY AVAILABLE TO DO THE WORK OF EVAPORATION. ... the relative humidity, all the while there was no change in the amount of vapor in the air. ...

• IT'S THE HUMIDITY!.
• GOAL: The student will understand the adverse effects of excess humidity and will recognize the importance of humidity control in the home. ...
• Define humidity and explain its relationship to heat. ...
• Describe the adverse effects of improper humidity levels. ...
• List ways of controlling humidity in the home. ...
• LESSON/INFORMATION: Humidity refers to the amount of moisture in the air. ...
• Relative humidity refers to the amount of moisture air holds in relation to the amount it could possibly hold at a given temperature. ... This is when relative humidity reaches 100% and condensation occurs. ...
• Humidity is a major factor in Louisiana's weather and comfort level for several reasons: 1. ...
• This mixture of heat and moisture results in an uncomfortably high humidity level for much of the year. ...
• Excess humidity in the home needs to be controlled. ... Not only is excess humidity uncomfortable, but it also adds to the air conditioning load. ...
• Excess humidity in the home can lead to odors, dampness, mold and mildew, fogged or sweating windows, and the decay of building materials. ...
• Excess humidity in the home comes from two basic sources: 1. ...
• Sources of humidity in the home. ...
• By following some of the above practices, humidity in the house can be reduced. As less humidity means less heat retained, the air conditioning unit will not have to work as hard to cool and dehumidify the home. ...

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