the amount of water vapor present in the air. Absolute Humidity- The amount of water vapor present in a unit volume of air. Relative Humidity-the ration of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature. R. H = Actual Water Vapor content/ Water Vapor Capacity (Maximum Capacity that the air can hold) Saturation Mixing Ratio- The water vapor capacity of air at given temperature. As temperature increases‚ water vapor capacity of air
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Lecture 1 Which gases are the primary constituents of the atmosphere 78% Nitrogen‚ 21% Oxygen‚ 1% Argon‚ .038% carbon dioxide‚ .002% Others What is the difference between weather and climate? Weather= atmospheric conditions at a particular time & place. (Temp‚ pressure‚ humidity‚ cloud cover‚ etc) Climate= the average weather over a long period of time. (long-term weather data) What is the difference between satellites and radar? Satellites view clouds from space Radar view precipitation
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as the ratio of the water vapor density (mass per unit volume) to the saturation water vapor density‚ usually expressed in percent: Relative Humidity (RH) = (Actual Vapor Density) -------------------- X 100% (Saturation Vapor Density) Relative humidity can be expressed by partial vapor and air pressure‚ density of the vapor and air‚ or by the actual
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Air contains a certain amount of water vapor. The amount of water vapor any mass of air can contain depends on the temperature of that air. The warmer the air is‚ the more water it can hold. A low relative humidity means that the air is dry and could hold a lot more moisture at that temperature. For example‚ at 20 degrees C (68 degrees F)‚ a cubic meter of air can hold a maximum of 18 grams of water. At 25 degrees C (77 degrees F)‚ it can hold 22 grams of water. If the temperature is 25 degrees
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resulting in increasing the air next to the ground. c. Irrigation – on potentially cold nights the grounds of orchards will be flooded since water has a high heat capacity; meaning it cools significantly cooler than dry soil will. Wet soil will also conduct heat upward keeping the surface warmer. d. Sprinkler System – emitting a find spray of water in cold air the water will freeze around the branches and buds which will coat with a very fine layer of ice. If the spray continues the latent heat keeps
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is not meant to be a complete list of everything that you need to know from the reading Water in Atmosphere You should know what is meant by phases of water and phase changes of water. Water vapor is extremely important in the atmosphere for many reasons. A few of those reasons include Water vapor transforms into both liquid and solid cloud particles that grow and fall to Earth as precipitation. When water vapor condenses in the formation of clouds‚ large amounts of heat - calledlatent heatis released
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the process of producing the greenhouse gases. This factor is human activity. Human activities which are bad for the environment include driving‚ burning of fossil fuels‚ and agriculture. Including water vapor‚ the percentage of man-made emission of greenhouse gases is 0.28%; excluding the water vapor‚ the percentage of human emission is 5.53%. It might not seem like much‚ but man made emission can really accelerate the making of greenhouse gases and make the process uncontrollable to make the earth
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Humidity Sensors Humidity Humidity is defined as the water vapor content in air or other gases. Humidity is usually measured in terms of absolute humidity (the ratio of the mass of water vapor to the volume of air or gas)‚ dew point (the temperature and pressure at which a gas begins to condense into a liquid)‚ and relative humidity‚ or RH (the ratio of the moisture content of air compared to the saturated moisture level at the same temperature or pressure). Thermal conductivity humidity sensors
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2005). The sensible heat gain results from radiation and convection from the human body to the air. The latent heat gain is the energy required to condense the water vapor given off by human respiration and perspiration. The latent heat gain is the product of the mass of water vapor from humans and the enthalpy of evaporation for water vapor at atmospheric pressure. Person Qtotal Qsensible Qlatent Avg. person‚ at rest 350 [Btu/hr] 210 [Btu/hr] 140 [Btu/hr] 100 W 60 W 40 W Avg. person
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sent to an instructor obseRvations & QUestions - paRt i A. Record your observations and your time and temperature data in tables. Use one table for the pure water and one table for the salt solution. Data Table 1: Pure Water and Salt Solution | Seconds | Distilled H20Room temp | Distilled H20 Ice bath | SaltwaterRoom temp | Saltwater Ice bath | 0 | 25 | 19 | 24 | 12 | 30 | 24 | 13 | 23 | 8 | 60 | 23 | 11 | 22 | 5 | 90 | 22.5 |
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