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Atmospheric pollutant concentrations expressed as mass per unit volume of atmospheric air (e.g., mg/m 3, μg/m 3, etc.) at sea level will decrease with increasing altitude because the atmospheric pressure decreases with increasing altitude. The change of atmospheric pressure with altitude can be obtained from this equation: [2]
mg/m 3 = milligrams of pollutant per cubic meter of air at sea level atmospheric pressure and T: ppmv = air pollutant concentration, in parts per million by volume T = ambient temperature in K = 273. + °C 0.082057338 = Universal gas constant in L atm mol −1 K −1: M = molecular mass (or molecular weight) of the air pollutant
defined in tsp minims ml minims ml Notes Fluid Ounce fl oz, f℥ 6 tsp*/ 8 fl dr 480: 29.57 480: 29.57 Tablespoon Tbsp 3 tsp*/ 4 fl dr 240: 14.79 240: 14.79 1 Tbsp = 3 tsp* Dessertspoon dsp 2 tsp 160 9.858 120 7.393 1 dsp = 2 tsp Teaspoon: tsp: 1 tsp: 80: 4.929 60: 3.697 1 tsp = 2 csp Fluid Dram fl dr, fʒ 3 ⁄ 4 tsp / 1 tsp: 60: 3.697 60: 3 ...
Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water.The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.
Metric measuring spoons, 1–125 mL Measuring Spoons, 1 ⁄ 8 thru 1 tablespoon Micro scoops for measuring milligram units of compounds; 6–10 mg (black), 10–15 mg (red), 25–30 mg (yellow) A measuring spoon is a spoon used to measure an amount of an ingredient, either liquid or dry, when cooking. Measuring spoons may be made of plastic ...
A teaspoon (tsp.) is a small spoon that can be used to stir a cup of tea or coffee, or as a tool for measuring volume. [ 1 ] [ 2 ] The size of teaspoons ranges from about 2.5 to 7.3 mL (0.088 to 0.257 imp fl oz ; 0.085 to 0.247 US fl oz ).
The human body makes one-eighth to one-fourth teaspoons of pure cholesterol daily. A cholesterol level of 5.5 millimoles per litre or below is recommended for an adult. The rise of cholesterol in the body can give a condition in which excessive cholesterol is deposited in artery walls called atherosclerosis. This condition blocks the blood flow ...
The recommended adequate intake of sodium is 1,500 milligrams (3.9 g salt) per day, and people over 50 need even less." [13] The Daily Value for potassium, 4,700 mg per day, was based on a study of men who were given 14.6 g of sodium chloride per day and treated with potassium supplements until the frequency of salt sensitivity was reduced to 20%.