White fluids

F. White, Fluid Mechanics 2nd ed., McGraw-Hill Book Co., Inc., New York, 1986. 

Fig. 10.7 Structural formulae of phenolic disinfectants A, clear soluble fluids B, black and white fluids C, chlorinated phenols D, bisphenols.

Styrene may also be added to give a pentapolymer. The polymer is of random orientation and preferably has a molecular weight of approximately 10,000 Dalton. The polymer is a low-viscosity chalk-white fluid that is soluble in water at a pH of 6 to 7. 

In addition to their mandibles, which are used to bite, pierce, shear, and cut intruders, soldiers of Coptotermes formosanus, a Formosan subterranean termite, are also armed with chemical weaponry. When disturbed, the soldiers secrete a gluelike white fluid from the frontal gland, which often form a drop between the open mandibles. Lignoceric and hexacosanoic acids were the two major components identified in this secretion [183]. 

To relate E with F imagine a steady flow of white fluid. Then at time / = 0 switch to red and record the rising concentration of red fluid in the exit stream, the F... 

Consider a steady continuous flow system of volume V characterized by a certain external RTD F(t) or/(f) dt, in which a white fluid flows at a constant volumetric flow rate of Q. 

Having the velocity profile, the evolution of mixing can be studied by computing the concentration distribution of a side-by-side fed black-and-white fluid, with concentrations (c = 1) and (c = 0) respectively, along the mixer, as shown in Fig. 7.42. 

Natural rubber is isolated from a white fluid, called latex, that exudes from cuts in the bark of Hevea brasiliensis, the South American rubber tree. Many other plants secrete this polymer, as well. The name rubber was first used by Joseph Priestly, who used the crude material to rub out errors in his pencil writing. Natural rubber is soft and sticky. An enterprising Scotsman named Charles Macintosh found that rubber makes a good waterproof coating for raincoats. Natural rubber is not strong or elastic, however, so its uses were limited to waterproofing cloth and other strong materials. 

Q12 Human milk is a bluish-white fluid with approximately 88% water, 6-8% carbohydrate (lactose), 3-5% fat and 1 -2% protein. The composition of milk varies from day to day and changes during a single feed the milk is watery at the start of a feed to satisfy thirst, but the fat content of the milk increases towards the end of the feeding period. 

White fluid acrylic copolymer emulsion of very fine particle size. VISCALEX HV30 is a highly thixotropic thickener producing non-stringy, high viscosity compounds which are easy to spread but tend not to penetrate the substrate. 

Appearance Milky-white, fluid emulsion Activity 24%... 

Type Hydrophobic thermosetting resin Appearance White fluid pH 6.5... 

Natural rubber, a terpene composed of repeating isoprene units, is isolated from latex, a sticky white fluid that oozes from Hevea brasiliensis, the South American rubber tree, when its bark is cut. The word rubber was first suggested by English chemist Joseph Priestly in 1770, when he used latex to rub out pencil markings. Rubber is a polymer containing 1,5-diene units in which all the double bonds have the Z configuration. In Chapter 30, we learn about the synthesis and properties of polymers like rubber. 

Clear soluble fluids, black fluids and white fluids... 

Black/white fluids Moderate/severe Very irritant May irritate skin Greatly reduced by dilution... 

Black fluids and white fluids are prepared by solubilizing the high boiling point tar acids. Black fluids are homogeneous solutions, which form an emulsion on dilution with water. White fluids are finely dispersed emulsions of tar acids, which on dilution with water produce more stable emulsions than do black fluids. Both types of fluid have good bactericidal activity. Preparations are very irritant and corrosive to skin, however, they are relatively inexpensive and are useful for household and general disinfection purposes. They must be used in adequate concentrations as activity is reduced by organic matter and is markedly affected by dilution. 

F. W. White, Fluid Mechanics, McGraw-Hill, New York, 3rd edition, 1994. 

The unripened seed of the opium poppy, Papaver somniferum, contains a milky white fluid. If the seed is lacerated and the fluid exposed to air, it dries and darkens to a thick black paste which has been known for centuries as opium. No other single plant shares the rich history of the opium poppy. Since the ancient empires of Mesopotamia through today, the opium alkaloids have been at the center of medicine, political turmoil, and economic growth, and this influence has been described in an excellent contemporary review.2 A collection of some interesting opium facts is summarized in Table I. 

A mixture of 33.0 g (100 mmol) of sodium tungstate dihydrate (Na2W04-2H20, 99%), 40mL of acetic anhydride, and 30mL of N,N-dimethylformamide (DMF) is stirred, in a 250-mL Erlenmeyer flask, at 100 °C for 3 h. A white fluid cream is obtained. 

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