the tube. Its height adjusts according to the air pressure on the reservoir. The column of mercury is shorter on a mountaintop as there is less atmosphere to exert a force on the mercury reservoir. On a mountaintop‚ the air pressure is less‚ so the height of mercury it balances in the barometer is shorter than at sea level where there is more air pressure. The pressure of mercury is its weight (force) per unit area. The weight‚ and thus the pressure‚ of the mercury column is directly proportional to
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relationship among the complete pressure and capacity of gas‚ if the temperature is reserved in stable within a closed system. The mathematical expression for Boyles Law is: V=K(1/P) or PV=K (Constant T and n) Where‚ P and V are the pressure and volume of the gas sample respectively. K is a constant and dependent of the temperature (T) and the amount of gas (n‚ moles). The Graph below successfully indicates Boyle’s Law visually: A: Volume Verses Pressure B: Volume Verses 1/P Part
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usually cubic metres (m3)‚ e.g. 200 mg/m3 or using ppm without any reference‚ e.g. 140 ppm Please note Because of the variation of a gas volume with temperature and pressure changes it is necessary to use one of the following alternatives for describing a concentration value: additional specification of gas temperature and pressure values existing during measurement or conversion of the measured concentration value into the corresponding value at standard zero conditions‚ see the following chapter
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September 16‚ 2010 Parental Pressure on Teens In the movie‚ American Teen‚ there were many types of parental pressures shown on teens entering college. This is a negative trait because more often than not‚ this leads the teen in the wrong direction or results in the teen making poor decisions. According to the PewResearchCenter‚ only nine percent of college students think that they need more parental pressure. In life‚ emotional‚ traditional and financial pressure will have a negative impact on
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slop of the pressure/volume(P/v) diagram‚ near the start‚ in the middle and at the end of the compression. 2. To determine the indicated work/cycle of the compressor from the P/v diagram. Where: Work/cycle=(m.e.p) x (piston-area) x stroke And m.e.p= mean effective pressure= average pressure(i.e stroke of the compressor) 3. To determine the volumetric efficiency of the compressor. A pressure transducer is used so that a potential drop will be created for a change in pressure. A similar
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(rounded to SF= 291 K) 2. 1 atm 1 atm 10 mm 10 mm 2.54 cm 2.54 cm According to the digital barometer our teacher provided‚ the barometric pressure in the lab is 29.77 in Hg‚ which will need to be converted to atmospheric pressure. 760 mm Hg 760 mm Hg 1 cm 1 cm 1 in 1 in 29.77 in Hg x x x = 0.9949 atm Barometric pressure: 756.2 mm Hg or 0.9949 atm 3. Volume of gas collected: 100.0 mL 4. Initial mass of butane lighter: 21.88 g 5. Final mass of butane lighter:
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surface and up to an altitude of about 80 km. 2. The five main components of the atmosphere are nitrogen ‚ oxygen‚ water vapor‚ ozone‚ and the particulates. 3. The cause of atmospheric pressure is exerted equally in all directions up‚ down‚ and sideways. 4. The two types of barometers measure atmospheric pressure ‚ atm ‚ millimeters and or inches of mercury and the millibars mb. Therefore‚ the two barometers are the mercurial and the aneroid. 5. The layer of the atmosphere in which weather occurs
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test is performed to determine the magnitude and rate of volumes decrease that laterally confined soil specimen undergoes when subjected to different vertical pressures. From the measured data‚ the consolidation curve can be plotted. This data is useful in determining the compression index‚ the recompression index and the preconsolidation pressure of the soil. In addition‚ the data obtained can also be used to determine the coefficient of consolidation and the coefficient of secondary compression of
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1) Helicobacter Pylori associated chronic gastritis resulting in duodenal ulceration or Peptic Ulcer Disease. Gastric pain at night and when hungry: ulcer is duodenal as the pyloric sphincter is open. Single punched-out lesion in the duodenum where 90% of peptic ulcers occur. H.Pylori most common cause of peptic ulcers. Erythematous stomach and history of dyspepsia: This indicates inflammation associated with chronic gastritis: result of long term hyperacidity in the
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Temperature‚ T (°C) RESULT Preassure‚ P (bar) | | | | | | Measure slope‚ dT/dP | Calculated slope‚Tvg/hfg | Gauge | Absolute | Increase (°C) | Decrease(°C) | AverageTavg (°C) | AverageTavg (K) | | | 0.1 | 1.1 | 104.0 | 106.6 | 105.30 | 378.45 | - | 0.260 | 0.2 | 1.2 | 107.3 | 109.3 | 108.30 | 381.45 | 0.3 | 0.243 | 0.3 | 1.3 | 109.8 | 111.8 | 110.80 | 383.95 | 0.25 | 0.227 | 0.4 | 1.4 | 112.0 | 113.9 | 112.95 | 386.10 | 0.22 | 0.213 | 0.5 | 1.5 | 114.3 | 115.9 | 115.10
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