Sealed glass bulb

Instead of weigliing the gases du-ectly, the buoyant force of a gas acting on a sealed glass bulb suspended in it can be measured. Since... 

Instruments designed to measme the buoyant force of a gas usually consist of a beam mounted on a fulcrum (Figure 8). On one end of the beam is attached a sealed glass bulb whose volume is large compared to the counterweight on the other end. This beam is contained in a gas-tight chamber with a windowed end which permits the beam to be observed. By altering the pressure of the gas in the chamber the beam can be balanced. A manometer attached to the chamber allows the pressure within to be measured. 

A sealed glass bulb contains a mixture of NO2 and N2O4 gases. When the bulb is heated from 20°C to 40°C, what happens to these properties of the gases (a) color, (b) pressure, (c) average molar mass,... 

Phases of matter. A sealed glass bulb is half filled with water, on which some ice and wood are floating. The remainder of the bulb is filled with air. How many phases does this system contain Identify them. 

Glass electrodes are now available as combination electrodes which contain the indicator electrode (a thin glass bulb) and a reference electrode (silver-silver chloride) combined in a single unit as depicted in Fig. 15.2(h). The thin glass bulb A and the narrow tube B to which it is attached are filled with hydrochloric acid and carry a silver-silver chloride electrode C. The wide tube D is fused to the lower end of tube B and contains saturated potassium chloride solution which is also saturated with silver chloride it carries a silver-silver chloride electrode E. The assembly is sealed with an insulating cap. 

NO2 N2 O4 (low temperature) A sample of NO2 sealed inside a glass bulb at 23 °C gave a pressure of 691 torr. Lowering the temperature to -5 °C converted the NO2 to N2 O4. What was the final pressure inside the bulb ... 

Fig. 12.2 Time dependencies of sonophotocatalytic reaction products from pure water. As powdered photocatalyst, Ti02-A (200mg, Soekawa, Commercial Reagent, rutile-rich type and specific surface area 1.9 m2/g) was used without further treatment. Liquid water (150 cm3, Wake, Distilled water for HPLC was used as reactant and was purged with argon, a Pyrex glass bulb (250-300 cm3) was used as a reactor and was placed m a temperature-controlled bath (EYELA NTT-1200 and ECS-0) all time. After the glass bulb was sealed, the irradiation was carried out under argon atmosphere at 35°C. Photo and ultrasonic irradiations were performed from one side with a 500 W xenon lamp (Ushio, UXL500D-O) and from the bottom with an ultrasonic generator (Kaijo. TA-4021-4611, 20C kHz 200 W), respectively.

The explosion of chloroform in contact with an alkali metal may be demonstrated by means of the apparatus illustrated in Figure 92. About 0.3 gram of sodium or of potassium or of the liquid alloy of the two is introduced into a thin-wall glass tube, or, better yet, is sealed up in a small glass bulb, 6 to 8 mm. in diameter, which has a capillaiy 15 to 20 mm. in length. The tube or bulb containing the alkali metal is placed in the bottom of a narrow test tube into which 1 or 2 cc. of chloroform has already been introduced, and the apparatus is then... 

When the glass membrane is exposed to water, a hydrated layer, approximately 50-100 nm thick, is formed at its interface. In addition to water, the chemical composition of the glass in this layer is the same as that in dry bulk. The concentration of the anionic binding sites is estimated between 3 and 10 M. The membrane is usually blown into a bulb of a typical thickness of the wall 50-200 jitm. The optimum thickness of the wall is a compromise between mechanical stability and the electrical resistance. The latter is typically on the order of 10MQ. The interior of this bulb is sealed and contains the internal reference electrode. Thus, the glass membrane is bathed on both sides by solution and a similar hydrated layer develops on the inside of the glass bulb as well (Fig. 6.14). 

Heats of immersion were measured using a batch calorimeter (Pravdic, 1976). It was an isoperibolic instrument with a thermistor detector of an average sensitivity of i 1 m3 (which corresponds to an estimated 13 i3/cm ). A sediment sample sealed in a small glass bulb was brought into the microcalorimeter cell and carefully equilibrated to a... 

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