SUBJECTS weighing

Berthelot subjected weighed quantities of the alcohols and certain volumes of nitrogen to the action of the silent electric discharge. In most cases the action was limited to 24 hours (when it was continued for a longer period, an absorption of nitrogen no longer occurred). He obtained the following results... 

When the workers were grouped according to physical characteristics, it was found that subjects weighing less than 50 kg showed less hand exposure in the afternoon than adults. No such differences were found when the group was divided according to height and body surface. 

Buoyant Effect of Air. Weighing operations performed m vacuo are not affected by buoyancy forces. An object in air, however, is subject to a buoyancy force that is equal and opposite to the gravitational force on the mass of air the object displaces (10). If the equal arm balance of Figure 1 is in balance with a test weight of mass, in one pan, and material of mass, m, in the other, m = m if they have the same density. If the densities are different, then the buoyancy forces acting on each pan affect the result. Taking moments about the center pivot point gives... 

After drinking an alcoholic beverage, a person s BAC rises to a maximum, typically in 30 to 90 minutes, and then drops steadily at the rate of about 0.02% per hour. The maximum BAC depends on the amount of alcohol consumed and the person s body weight. The data cited in Table A are for male subjects females show maximum BACs about 20% higher. Thus a man weighing 60 kg who takes three drinks may be expected to reach a maximum BAC of 0.09% a woman of the same weight consuming the same amount of alcohol may show a BAC of... 

B. 5-Hexynal. To a solution of 5.60 g. (0.050 mole) of 2,3-epoxycyclohexanone in 120 ml. of benzene in a 500-ml. round-bottomed flask is added 10.82 g. (0.051 mole) of trans-1 -amino-2,3 diphenylaziri-dine.2 Initially, after brief swirling at room temperature, the reaction mixture is a colorless, homogeneous solution however it rapidly turns yellow and cloudy due to separation of water. After 2 hours the benzene and water are removed as an azeotrope under reduced pressure on a rotary evaporator with the bath maintained at approximately 30°. The resulting crude mixture of diastereomeric hydrazones weighs 15.4 g. (Note 7) and is subjected directly to the fragmentation reaction (Note 8). 

A weighed portion of the AOS sample is dissolved in water and ethanol containing a small amount of n-decane and the mixture is shaken with petroleum spirit. The organic phase is subjected to GC using a 2 m x 10 mm packed column of 5% carbowax 20M on Chromorb T applying the following conditions ... 

When the mixture has cooled sometvhat, 75 to 100 cc. of absolute alcohol is added. After all the particles of sodium have reacted, 500 cc. of water is added, the condenser is arranged for downward distillation, and the benzene and unchanged />-chlorobiphenyl are removed by distillation from a steam bath (Note 7). The crude product remaining in the flask is separated by filtration, washed with 100-200 cc. of water, and pressed as dry as possible. The solid is dissolved in 600 cc. of xylene in a 1-1. distilling flask, and the solution is subjected to distillation until 25 to 50 cc. of distillate (xylene and water) has been collected. The solution is cooled somewhat, 1 to 2 g. Norite is added, and then the mixture is boiled for five minutes. The hot solution is filtered rapidly and the filtrate is cooled. The product is collected by filtration, washed with 25 to 50 cc. of cold xylene then with 200 cc. of petroleum ether, and dried. The tribiphenylcarbinol forms small white crystals which melt at 207-208°. The product weighs 57-65 g. (35-40 per cent of the theoretical amount) (Note 8). 

Meteorite ALH84001 was found in the Allan Hills in Antarctica in 1984 and was the subject of an extraordinary NASA press announcement in 1996. It weighed 1.93 kg when it was collected (Figure 6.10) and is probably the most extensively studied lump of rock of all time. It is 95 per cent orthopyroxene, the volcanic rock mineral that accumulated in a molten-lava-reducing environment on Mars some... 

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