Prefixes VOLUME

A vacuum flow apparatus was used in experiments on hydroxyl reactions (Fig, I). The free hydroxyl, together with other active species and nondisssociated water molecules, was pumped out of the high-voltage discharge zone into the reaction vessel, through a nozzle. The substance studied was introduced into the reaction vessel from a flask of prefixed volume, through a stopcock valve. The reaction vessel was heated by means of an electric furnace. The temperature constancy was checked by means of thermocouples at various sites in the reaction vessel. 

Fig. 1. Scheme of apparatus. 1—Discharge tube 2—flask with water 3—nozzle 4—reaction vessel 5—electrical furnace 6—stopcock valve 7—thermocouple 8—trap 9—manometer 10—slides 11—spectrograph slit 12—hydroxyl source 13—discharge tube electrodes 14—transformer 15—vessel of prefixed volume. 

Prefixes. In SI, 20 prefixes are used and are direcdy attached to form decimal multiples and submultiples of the units (see the introduction to this volume, p. xvi). Prefixes indicate the order of magnitude, thus eliminating nonsignificant digits and providing an alternative to powers of 10 eg, 45 300 kPa becomes 45.3 MPa and 0.0043 m becomes 4.3 mm. 

Both common and systematic names of compounds are used throughout this volume, depending on which the Editor-in-Chief feels is most appropriate. Preparations appear in the alphabetical order of names of the compound or names of the synthetic procedures. The Chemical Abstracts indexing name for each title compound, if it differs from the title name, is given as a subtitle. Because of the major shift to new systematic nomenclature adopted by Chemical Abstracts in 1972, many common names used in the text are immediately followed by the bracketed, new names. Whenever two names are concurrently in use, the carre CChemical Abstracts name is adopted. The prefix n- is deleted from -alkanes and w-alkyls. All reported dimensions are now expressed in S st me International units. 

The selected papers in the present anthology are numbered from SP 1 to SP 144 in the somewhat arbitrary sequence in which they are presented. Throughout the two volumes the selected papers are identified by Selected Paper number , with the prefix SP . The SP designation is used to forestall confusion between the SP numbers used in the main text and the other numbers used in Chapter 18 (the Biographical Memoir) and in the appendices. Appendix I is a conversion table between the SP... 

Boehme, Jacob.The works of Jacob Behmen, the Teutonic philosopher. Volume 1. Containing, I. The Aurora. II. The Three principles. To which is prefixed, The Life of the author. With figures, illustrating his principles, left by the Reverend William Law, M.A. Edited by G. Ward and T. Langcake. London Printed for M. Richardson, in Pater-noster Row, 1764. vp... 

Cross references to related group or sub-group entries are also included, with a group list of the names and serial (not page) numbers of the chemicals appearing in Volume 1 which lie within the structural or functional scope of the group entry title. Compounds which are closely similar to, but not in strict conformity with, the group definition are indicated by a prefixed asterisk. 

This example addresses the quantification and combination stages of uncertainty calculations. The first stage is to convert any data that are not already given as a standard uncertainty (i.e. prefixed by u). In this example, the data associated with the purity ( 0.1%) and the information from the supplier s catalogue on the volume of the solution ( 0.4 ml) fall into this category. 

The measurement system that you will most likely encounter is the SI (Metric) system. Each quantity (such as mass and volume) has a base unit and a prefix that modifies the base unit. The prefixes are the same for all quantities and are based on a decimal system. Below are some basic SI units we will introduce others in later chapters ... 

As shown above, the SI unit for volume is the cubic meter (m3), but most chemists use the liter (L, which is equal to 1 cubic decimeter (dm3)) or milliliter (mL). Appendix A lists the SI base units and prefixes, as well as some English-SI equivalents. 

The prefixes can be used with any of the following meters measure length, liters measure volume, and grams measure mass. 

He can work with these prefixes in ratios of units such as g/mL or nmol/mL, and he can also accept dm or cm for volume. 

The following checklist of isoflavonoids contains compounds reported in the literature as natural products to the end of 2004. Compounds published before 1991 are referenced to numbered entries in Volume 2 of the Handbook of Natural Flavonoids (J.B. Harborne and H. Baxter), John Wiley Sons, Chichester, 1999, using a number consisting of four digits. Compounds published in the period 1991-2004 are referenced with numbers having F as prefix before the number of the publication found in the reference list. The various isoflavo-noid classes are shown in Figure Al. 

The most common way of representing volume in chemistry is by using liters (L). You can treat the liter like you would any other metric base unit by adding prefixes to it, such as milli- or deci-. 

The metric system, or Systeme International d Unites (SI system as it is commonly known), is the predominant system of measurement in the world. In fact, the United States is one of only about three countries that do not commonly use the metric system. The metric system attempts to eliminate odd and often difircult-to-remember conversions for measurements (5,280 feet in a mile, for example). It is a decimal-based system with standard terminology for measurements of length, volume, and mass (weight). It also uses standard prefixes to measure multiples of the standard units. 

Letters and 2727 to the page number. For journals which are published in separate parts, or which have more than one volume per year, the appropriate part or volume is indicated, e.g. (73JCS(P2)1594) refers to /. Chem. Soc., Perkin Trans. 2, 1973, p. 1594. A full list of journal codes is reproduced in each Volume. Patents have three-letter codes as appropriate, e.g. (60USP2922790) refers to U.S. Pat. 2 922 790 (1960). Books which are frequently referred to are also given a code, preceded by the letter B, e.g. (B-73NMR96) refers to T. J. Batterham, NMR Spectra of Simple Heterocyclics , Wiley, New York, 1973, p. 96. Journals and books which are referred to rarely are coded MI for miscellaneous, books again being indicated by the B- prefix. 

Microfluidics is about the flow of tiny amounts of liquids. The prefix micro indicates that at least in two dimensions, the liquid should be confined in micrometer dimensions. If we are, for instance, dealing with a channel, its width or diameter should be below 100 /tm to earn the title microchannel . Please note that a microliter is a relatively large volume in microfluidics since it is equal to the volume of (1 mm)3. 

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