Glass expansion

The Ubbelohde viscometer is shown in Figure 24c. It is particularly useful for measurements at several different concentrations, as flow times are not a function of volume, and therefore dilutions can be made in the viscometer. Modifications include the Caimon-Ubbelohde, semimicro, and dilution viscometers. The Ubbelohde viscometer is also called a suspended-level viscometer because the Hquid emerging from the lower end of the capillary flows down only the walls of the reservoir directly below it. Therefore, the lower Hquid level always coincides with the lower end of the capillary, and the volume initially added to the instmment need not be precisely measured. This also eliminates the temperature correction for glass expansion necessary for Cannon-Fen ske viscometers. 

The cooled reactor was vented into a glass expansion bulb from which samples could be withdrawn for gas chromatographic analysis. The reactor contents were washed with tetrahydrofuran (THF) into a (fry Soxhlet thimble and were then extracted with THF for about 24 hr under nitrogen. The THF was removed from the extract by rot evaporation. The solid residue was dried at 100 C for 18-20 hr before weighing. The gas yield was calculated by difference from the weights of the liquids and the THF-insolubles. 

Corrections required when weighing volumetric flasks are somewhat different than straight volumetric readings. Both single- and double-pan balances have four common parameters which can affect the accurate weighing of liquids, but the single-pan balance has one separate parameter of its own. The common parameters are water density, glass expansion, and the buoyancy effect. 

A frilly de-mountable ABC TJA IRIS Radial torch was equipped with a Twister cyclonic spray chamber for the non-hydrofluoric (HF) acid analyses. Both are available from Glass Expansion Inc, Pocasset, Massachusetts, USA. When analyzing samples prepared with a dilute HF acid solution, an alumina center tube and HF resistant spray chamber (Glass Expansion) were substituted. The nebulizer used was a Teflon Mira Mist that is available from Burgener Research Inc., Mississauga, Ontario, Canada. 

Figure 7.33 (a) The components of a liquid sample introduction system for ICP glass concentric nebulizer, demountable three piece quartz torch, torch body, and glass cyclonic spray chamber, (b) The components assembled for use. This torch design is typical of that used in Jobin Yvon ICP instruments. [Courtesy of Glass Expansion Pty, Ltd., Australia (www.GEICP.com).]... 

Thermal expansion curves for amorphous metals closely resemble those of non-metallic glasses. Expansion coefficients for the composition Fe4oNi4oPi4Bg are almost identical in the amorphous and crystalline... 

Figure 7.30 (a) Meinhard glass concentric nebulizer, showing a ciose-up of the tip. (b) SeaSptay nebuiizer from Glass Expansion. Compare the sample path shown in (a) to the uniform capiiiary in this nebulizer and the difference in the tips, (b Courtesy of Glass Expansion Pty, Ltd., Melbourne, Victoria, Australia, www.geiop.com.)... 

The aim of this work is to study basalt quarries located in the NE of Argentina to identify deleterious species, mainly fresh and devitrified volcanic glass, expansive clays and residual cryptocrystalline silica. 

Glass Expansion, Conduethrity, Index Resistance Specimen 2000 psi. 

FIGURE 3.8 The OpalMisP microflow concentric nebulizer made from PFA (courtesy of Glass Expansion Inc.). 

FIGURE 3.13 The low-flow Cinnabar , a water-cooled cyclonic spray chamber for use with a microflow concentric nebulizer. (Courtesy of Glass Expansion, Inc.)... 

Skylane Boulevard Santa Rosa, CA 95403 Phone 800-878-7654 Fax 707-545-7901 www.cpiintemational.com Glass Expansion Pty. 

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