Normalization, atmospheric

In incompressible fluids, such as water, the vertical structure of temperature very simply reveals the stability of the fluid. When the lower layer is warmer and thus less dense than the upper layer, the fluid is unstable and convective currents will cause it to overturn. When the lower layer is cooler than the upper layer, the fluid is stable and vertical exchange is minimal. However, because air is compressible, the determination of stability is somewhat more complicated. The temperature and density of the atmosphere normally decrease with elevation density is also affected by moisture in the air. [Pg.251]

In this section, chemical resistance will be divided into three parts, viz. acid, alkali (including detergents) and water (including atmosphere). Normally an enamel is formulated to withstand one of the corrosive agents more specifically than another, although vitreous enamel as a general finish has good all round resistance, with a few exceptions such as hydrofluoric acid and fused or hot concentrated solutions of caustic soda or potash. [Pg.740]

An allotropic form of oxygen (03) (see Allotropy) of considerably greater degradative effect on rubber than oxygen itself. The ozone content of the atmosphere normally varies from 0.5 to 5.0 parts per 100 million (pphm) of air, but in certain areas (notably Los Angeles, USA) it may reach as much as 40 pphm of air. [Pg.45]

If the exterior of the thermowell becomes fouled, the indicated temperature, generated by the thermocouple, will drop. The problem is that the external cap of the thermowell assembly radiates a small amount of heat to the atmosphere. Normally, this has a negligible effect on the indicated temperature. However, when the process temperature is 600 to 800°F, the thermowell is in a vapor phase, and the thermowell becomes coated with coke, I have seen the indicated tem-... [Pg.70]

A significant concern in the use of total radiation pyrometry is that it must be calibrated at the distance it will be from the source because of the influence of the atmosphere. Normal atmosphere contains a small fraction of carbon dioxide and water vapor (the latter dependent on the relative humidity, which varies with the day). When combustion is used for furnace heating (e.g. CH4+2O2 = 2H2O+CO2), water vapor and carbon dioxide are the predominant, atmospheric constituents. As... [Pg.222]

Good contact between alkali metal and organic chloride can be effected using a sand or dispersion formed by stirring the molten metal under an inert solvent, such as n-decane. The surface of the alkali metal must be free of impurities or products of the reaction (RM and MX). Success may depend on the choice of alkyl halide, the solvent, and temperature (T), which must be below the decomposition T of the organoalkali in the solvent utilized, and the reaction must be conducted under an inert atmosphere, normally Nj. [Pg.182]

Figure 13-13 Plots of the vapor pressures of the liquids in Table 13-4. The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere. Normal boiling points are water, 100°C benzene 80.1°C methyl alcohol, 65.0°C and diethyl ether, 34.6°C. Notice that the increase in vapor pressure is not linear with temperature.

In the early 2000s, however, some scientists suggested that some types of microscopic life may, indeed, he able to survive in the Venusian atmosphere. Some of the strongest proponents of a Venusian microbe theory have been Dirk Shulze-Makuch and Louis Irwin at the University of Texas at El Paso (UTEP). The UTEP researchers have pointed to the presence of both hydrogen sulfide and sulfur dioxide in proximity to each other in the planet s upper atmosphere as evidence for the existence of microorganisms in the Venusian atmosphere. Normally, those two gases tend to react with and destroy each other. About the only condition under which they remain in equilibrium on Earth is when both are being produced by anaerobic bacteria. [Pg.103]

Current theories suggest that Neptune s internal structure is similar to that of the other gas giant planets in that its density gradually increases from the outer atmosphere to the center of the planet. Deeper into the atmosphere, normally gaseous materials are exposed... [Pg.161]

As viewed from the top, the plasma has a circular, doughnut shape. The sample is injected as an aerosol through the centre of the doughnut. This characteristic of the source confines the sample to a narrow region and provides an optically thin emission source and a chemically inert atmosphere. Normally, samples are introduced as a solution into the plasma and argon is used as a carrier gas for the sample introduction. The much higher temperatures of the plasma compared to flame make ICP-AES more effective in detecting lower concentrations of refractory elements such as Ta, W and Zr, and rare earth elements. [Pg.82]

A sound wave is manifested as one kind of the atmospheric normal modes, known as the acoustic mode, and is caused by the compressibility of air. There are two more kinds One is called the gravity-inertia mode, which is caused by a combinations of the restitutive force of gravity against thermally stable atmospheric stratification and the Coriolis force due to the earth s rotation. The other kind is called the rotational or planetary mode, which is caused by the meridional variation of the Coriolis force. The importance of the latter kind of normal mode as a prototype of upper tropospheric large-scale disturbances was clarified by C. -G. Rossby and his collaborators a little over one decade prior to the dawn of the numerical prediction era (see Section I). In retrospect, the very natrrre of this discovery was hidden in complicated calcnlations for the normal modes of the global atmospheric model. The mathematical analysis was initiated by the French mathematician Marquis de Laplace (1749-1827), and the complete solntions became clear only with the aid of electronic compnters. It is remarkable that Rossby was able to capture the essence of this important type of wave motion, now referred to as the Rossby wave, from a simple hydrodynamic principle of the conservation of the absolute vorticity that is expressed by the sum of the vertical component of the relative vorticity and the planetary vorticify /. [Pg.369]

PRESSUSRE OR STRESS (FORCE/AREA) atmosphere (normal = 101 325 202 650 303 975 405 300... [Pg.585]

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