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ISU GEO 211 - Air pressure- force exerted by the weight of air above a given point
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GEO 211 1st Edition Lecture 20Outline of Last Lecture I. Measuring precipitationA. Standard rain gauge- commonly used- Cross section= 10 times that of tube- Measurable amount= 0.01 inch OR greater- Less than 0.01 is reported as a traceB. Tipping bucket rain gauge- consists of 2 buckets - Each time a bucket fills up with 0.01 inch of rain, it tips, sending an electric signal to the remote recorderC. Weighing gauge- collects rainfall in a cylinder that sits on a sensitive weighing platform- When cylinder fills up, electrical impulse is transmitted to a pen that records the dataII. Measuring snowfallA. 2 measurements of rainfall1. Depth (with calibrated stick)2. Water equivalent (general ratio is 10:1)o Ex: 10 inches deep= 1 inch of rainfallIII. Cloud seeding- Silver iodide and dry ice are injected in a cloud to act as condensation nuclei- Works better in cold clouds with super cooled water- Silver iodide- commonly usedOutline of Current Lecture IV. Air pressure- force exerted by the weight of air above a given pointA. Pressure measurementsa. Units used on weather maps: B. Standard atmospheric pressure at sea level- 1013.25 mb= 1013.25 hPa=29.92 in. Hg= 760 mm. HgThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- High pressure- Low pressure- Wind C. Measuring pressureA. Barometers1. Mercury barometers2. Aneroid barometers- Altimeter BarographB. Air pressure and altitude decreased rapidly with altitude first, but decreases slowly with altitude alofCurrent LectureIV. Air pressure- force exerted by the weight of air above a given point- Decreases with heightA. Pressure measurementsa. Units used on weather maps:- Millibar (mb): 1 bar= 1000mb- Hectopascal (hPa): 1 hPa= 1mb- Inches of mercury (in. Hg)- Millimeters of mercury (mm. Hg) B. Standard atmospheric pressure at sea level- 1013.25 mb= 1013.25 hPa=29.92 in. Hg= 760 mm. Hg- High pressure- long column of air exerts more pressure- Low pressure- short column of air exerts less pressure- Wind- air moves from high pressure to low pressure C. Measuring pressureA. Barometers1. Mercury barometers- invented in 1643 by Torricelli Evangelista (Figure 8.6)2. Aneroid barometers- non liquid- Altimeter: calibrated to indicate attitude (Figure 8.7)- Barograph: recording barometer (Figure 8.8)B. Air pressure and altitude decreased rapidly with altitude first, but decreases slowly with altitude alof- At about 18,400 f (5 km), pressure is almost half (500 mb) of its


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ISU GEO 211 - Air pressure- force exerted by the weight of air above a given point

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