Union Pacific FEF Series was created in 1937.
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forced expiratory flow
forced expiratory flow
fef
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The compound formed from iron and fluorine is called iron(III) fluoride, with the chemical formula FeF₃. In this compound, iron has a +3 oxidation state, which corresponds to the presence of three fluoride ions (F⁻) for every iron ion. There is also another compound called iron(II) fluoride (FeF₂), where iron has a +2 oxidation state.
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It means .50 in U.S. coin
FEF 25-75, or Forced Expiratory Flow between 25% and 75% of the FVC (Forced Vital Capacity), is calculated using the flow-volume loop obtained from spirometry. You first determine the volume at which 25% and 75% of the FVC is exhaled. Then, you measure the average flow rate (in liters per second) between these two volumes, providing an assessment of the mid-expiratory flow rate and indicating possible airflow obstruction.
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