4.1.6 Relative Humidity Data Analysis
Relative humidity is the relative measure of the extent of moisture in the air to the amount required to saturate the air at the identical temperature. The relative humidity of the air is mostly contingent on temperature and rain fall. According to Shaw, 1985, relative humidity is the relative measure of the amount of moisture in the air to the amount needed to saturate the air at the same temperature ed/ea represents as a percentage. RH=(ed/ea) 100 where: - RH is relative humidity, ed is actual vapor pressure at the dew point, Td; ea is saturated vapor pressure at air temperature, Ta
As air humidity is in an instance of increasing, its ability to absorb water vapor decreases and evaporation rate slows down. For evaporation to undergo there must be a difference in humidity (Tenalem Ayenew and Tamiru Alemayehu, 2001; Fetter C.W, 1994).
Table 4.9 Relative humidity (%) stations in the study area stations Jan Feb Mar Apr May Jun Jul Aug
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In many instances a value for the potential evapotranspiration is calculated at a close by climate station on a reference surface, conventionally short grass. This value is known as the reference evapotranspiration, and can be changed to a potential evapotranspiration by multiplying with a surface coefficient. In whatever way, this particular procedure is depend on the assumption that PET is affected only by meteorological circumstances, does not take into account the effect of vegetative density and maturity. The Thornthwaite method is known to methodically underestimate PET in more arid regions and seasons. Quantifying of the potential evapotranspiration, calculated on monthly principles, is given
Considering the fact that Marc has both been sweating and drinking minimal amounts of water, Marc is now dehydrated. This means he has less than the required amount of water for his body to complete the processes necessary to maintain its health. As stated in the question, the process of sweating causes the loss of more water than solutes. This means that as the level of water decreases, the level of solute concentration will increase, creating a change in the water to solute ratio.
These leaves will also have no threat of excessive transpiration because the temperature in the shaded area will be lower and the humidity probably higher. Transpiration is the removal (evaporation) of water from a plant through the stomata in the leaves; this water is removed in a cycle due to the active uptake from the roots. Transpiration involves osmosis; which is the diffusion of water from a high concentration to a lower concentration through a partially permeable membrane, until both the concentrations are equally saturated. All these factors i.e. transpiration and photosynthesis, come together to confirm my hypothesis. To support my hypothesis further, I did a pilot study in a meadow in which I studied the population of certain plant species in areas of
Foliage Projective Cover (FPC) is a measure of vegetation density represented by the percentage of ground covered by photosynthetic overstorey foliage (Scarth, Armston & Danaher 2008). As changes in FPC over time can indicate land clearing, the Statewide Landcover and Trees Study (SLATS) was initiated in Queensland to provide quantitative data to assess the related greenhouse gas emissions (Goulevitch, Danaher & Walls 1999). Originally SLATS used Landsat TM imagery to predict FPC across Queensland and New South Wales, but recently adopted SPOT 5 imagery (Flood et al. 2013; Kuhnell et al. 1998). SPOT and Landsat FPC Products have been found to differ for some land cover types (Phinn 2014).
A humidifier is good for creating moisture in a room. It converts water to moisture and slowly fills the air. It should be noted to not overuse the humidifier as this can create respiratory problems later. It has the same effect as the steam in that it clears your stuffy nose by thinning the mucus. Breathing in humid air relieves inflammation causing the congestion. It clears the stuffy nose by soothing the irritated tissues and swollen blood vessels.
The effect of water quality on Vegetative measurements and photosynthesis indices of the trees are presented in Table 1. No significant differences were found between parameters: gs, shoot number in both years, but others were higher in RW application. Height of trees and leaf area in first year was not significant but in second year it increased by 42 and 29% respectively in application RW. Photosynthesis rate appears significantly higher (23.4 µmol m−2 s−1) in plants receiving recycle water than clean water.
There are numerous stages that take place simultaneously in the hydrologic cycle and this includes evaporation. This is when the water alters from a liquid state into a gas. The damp air from the water rises into the atmosphere and when it cools, the vapor condenses and shapes into clouds. But those billows are not the only form the vapors make; it can also materialize as dew, fog and mist, which blanket the Earth, characteristically on a rainy or humid day. Evaporation takes place when water changes from a liquid state into a gaseous state, and ascents out of the pores of the earth and into the atmosphere as a vapor (“How”). While evaporation is taking place, condensation is also occurring. When the temperature in the air plunges, the clouds become heavy and as a result they relieve themselves of the extra weight, which is called precipitation. This produces rain, hail, snow and sleet, conditioned upon the temperate. As the precipitation falls, it enters the surface of the ground and percolates into the soil, which is called infiltration. The more porous the land is, the more the infiltration can take place. However, the ground cannot hold all of that water and floods. The excess rainfall, which is also called runoff that has not been absorbed makes its way into bodies of water, such as small ponds, rivers, lakes and parts of the ocean (“Summary”).
Humidity and wet conditions inside your home can lead to all sorts of problems. If they’re not taken care of, it can lead to health issues. While some areas aren’t known to be humid, there is still in the air, especially in basements of homes. If you have a basement, water can get into it and allow fungus and bacteria to flourish. By installing a dehumidifier in any wet area, you’ll decrease the amount of moisture and prevent them from becoming a larger issue. You’re probably wondering where you can find a dehumidifier to limit the moisture. You can find some online or through your local hardware store. While some dehumidifiers work better than others, it’s important to understand why you need one. Limiting moisture to your home will help keep the home’s resale value higher. There are some other
Controlling the amount of moisture in your home or in a specific area of your home is essential to preventing mold. Other key ways include:
Trees kept the moisture in certain level in surrounding areas of trees by transpiration process. In the transpiration process trees inhales the water by their root and exhales water by their stomata.This process is called transpiration. By the transpiration process trees reduces the adjacent air temperature by some degrees. This reducation rate can vary from tree to tree and species to species. This level of changes makes huge impacts in arid and semi arid environment.
High humidity hampers the body’s cool-down mechanism. When the outside temperature is near the temperature of the body, the body undergoes changes to cool down, one of these changes is sweating. However, sweat only cools the body when it is able to evaporate on the skin. Humidity creates a damp environment, which prevents the sweat from evaporating and the air from absorbing the sweat. This creates a feeling of heat and stickiness. This can create fatal situations, because the body temperature increases, leading to the body working excessively to cool down, causing the body to lose many necessary chemicals and the water of the body. When the body is dehydrated, the blood thickens, placing strain on the heart, because it must add pressure to pump the blood efficiently. This would also cause the body to overheat, which can lead to heat cramps, fainting, heat exhaustion, and heat stroke. Heatstroke is known to be fatal and is considered to be the most serious form of heat injury (AchooAllergy, 2014).
Evaporation goes through a physical change because the liquid(s) get evaporated into the atmosphere and turn into a gas called water vapor. Next, it gets turned back into a liquid and comes back down to the ground as rain. This process is called the water cycle and it's a physical change because it can be changed into a new substance but can be changed back to its original substance. This information came from what I already knew from previous science classes.
Wladimir Koeppen developed the first quantitative climate classification in 1900. Koeppen’s system was based on the principle that plants integrate several climate elements. Koeppen fitted isolines of temperature and precipitation data to the five vegetation groups identified by the French botanist De Candolle, which were based on the late Greek climate zones: (1) A, the plants of the torrid zone; (2) C, plants of the temperate zone; (3) D and E, frigid zone (no plants); (4) B, for plants of the dry zone. Koeppen added sequential letters to account for moisture (rainfall), for a better description of maximum and minimum temperatures, for the seasonal distribution of rainfall (Sanderson, 1999), and for special features such as fog incidence.
The simultaneous heat and mass transfer to changes the temperature of the wet solid to evaporate its surface moisture and the transfer of moisture to the surface of the solid for subsequent evaporation from the surface to the surrounding atmosphere take place during drying processes. Normally, the hot air or combustion gases surrounding the feed are the drying medium. The psychrometry and the use of humidity charts determine the actual quantities of air required to remove the moisture liberated by evaporation. During heat transfer to a wet solid, the temperature Gradient developed within the solid and the moisture evaporation from the surface become the driving force for migration of moisture from within the solid to the surface, which occurs through diffusion, capillary flow, internal pressures due to the shrinkage during drying, and repeated and progressive vaporization and re-condensation of moisture to the exposed surface in the case of conduction type indirect drying. An appreciation of this internal movement of moisture is important when it is the controlling factor, as it occurs after the critical moisture content, in a drying
a change in the water cycle. Some places may experience more rain. Warmer temperatures will
The condensation problem-A humidifier can lead to condensation if it is not in impeccable working order or if the settings chosen are wrong. Such a humidifier will facilitate growth of bacteria, mold and dust mites. The microorganisms will not only be a threat to your hygiene but also make symptoms of asthma much worse. Millions of people including kids and the elderly are allergic to these microorganisms.