Sweating glass

Specific ion electrodes, similar in design to the glass electrode, have been developed to analyze for a variety of cations and anions. One of the first to be used extensively was a fluoride ion electrode that is sensitive to F- at concentrations as low as 0.1 part per million and hence is ideal for monitoring fluoridated water supplies. An electrode that is specific for Cl- ions is used to diagnose cystic fibrosis. Attached directly to the skin, it detects the abnormally high concentrations of sodium chloride in sweat that are a characteristic symptom of this disorder. Diagnoses that used to require an hour or more can now be carried out in a few minutes as a result, large numbers of children can be screened rapidly and routinely. 

When we had gone slightly past the place where Dennis and I had parted, we came upon something that could not be fit into any set of expectations. This was Dennis s ruana, a short blanket worn by South American peasants, and his shirt discarded in the middle of the path. Next came a pair of pants and then further on two sweat socks. And, though I was to learn this only later, his glasses and his boots had also been hurled away. We followed this trail of cast-off garments back to the hut in the forest. There we found Ev... 

A glass jug of milk on a gas ring appears to "sweat" The jug is not leaking What is happening is that hydrogen from the gas supply and oxygen in the air burn together, to form steam. This condenses as tiny droplets of water on the cold surface of the ]ug - a microcosm of how the oceans were formed. 

Methamphetamine, a Schedule 11 drug, was first synthesized in 1919. It can be synthesized from ephedrine or pseudo-ephedrine. Methamphetamine is available by prescription for weight control, ADHD, and narcolepsy under the brand name Desoxyn . Street names for methamphetamine include chalk, crank, crystal, fire, glass, ice, rocks, shabu, speed, and yaba. Methamphetamine is often found at rave sites, where people exert themselves while dancing and deprive themselves of sleep, food, and drink, which can result in increased body temperature with excessive sweating and possibly a salt imbalance. 

Endothermic processes are common in our everyday experience. Examples include the melting of ice cubes in a glass of water, or the evaporation of sweat from our skin. In these cases, the greater entropy of the products favors the utilization of energy to allow these processes to occur (Case III). A dramatic example is a chemical cooling pack that contains a salt (usually ammonium nitrate,... 

These consist in testing the vamish to ascertain its applicability to the purpose for which it is intended. To this end it is spread in a thin layer on a smooth metal (tinned iron) or glass surface and allowed to dry in the air. The time necessary for complete drying and the appearance are noted, and the film of vamish tested to ascertain if it adheres well. After some time the film is observed to see if it has cracked or sweated, i.e., become oily to the touch. 

Shielded safety glasses are comfortable, do not cause fogging or sweating, and give good eye protection in many situations. Safety glasses must have both brow and side shields. 

Compared to other drugs of abuse, analysis of cannabinoids presents some difficult challenges. THC and 11-OH-THC are highly lipophilic and present in low concentrations in body fluids. Complex specimen matrices, i.e., blood, sweat, and hair, may require multi-step extractions to separate cannabinoids from endogenous lipids and proteins. Care must be taken to avoid low recoveries of cannabinoids due to their high affinity to glass and plastic containers, and to collection devices for alternate matrices (Blanc et al. 1993 Bloom 1982 Christophersen 1986 Joern 1992). THC and THCCOOH are predominantly found in the plasma fraction of blood, where 95% to 99% are bound to lipoproteins. Only about 10% of either... 

When a small-diameter glass tube, or capillary, is placed in water, water rises in the tube. The rise of liquids up very narrow tubes is called capillary action. The adhesive forces between the liquid and the walls of the tube tend to increase the surface area of the liquid. The siuface tension of the Uquid tends to reduce the area, thereby pulling the Uquid up the tube. The Uquid climbs until the force of gravity on the Uquid balcuices the adhesive and cohesive forces. CapiUary action is widespread. For example, towels absorb Uquid and stay-dry synthetic fabrics move sweat away from the skin by capillary action. Capillary action also plays a role in moving water and dissolved nutrients upward through plants. 

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