Though prior to 1834 several suggestions had been made with regard to the production of ice and the cooling of liquids by the evaporation of a more volatile liquid than water, the first machine actually constructed and put to work was made by John Hague in that year from the designs of Jacob Perkins (Journal of Soc. The plants thrive best in moist districts, and in dry ones evaporation may be prevented by covering the ground near them with cocoa-fibre mixed with sand. It may be obtained by extracting powdered gall-nuts with a mixture of ether and alcohol, whereupon the tannin is taken up in the lower layer, which on separation and evaporation yields the acid. evaporite deposits produced by the repeated evaporation of seasonal lakes (see playa ). One Drop Perfume is an oil-based fragrance concept manufactured by Egyptian Potion that promises long wear without the evaporation that occurs in alcohol-based essences. 3. The solution is best prepared by dissolving the hydrate in hydrochloric acid and removing the excess of acid by evaporation, or by passing chlorine into the solution obtained by dissolving the metal in hydrochloric acid and removing the excess of chlorine by a current of carbon dioxide. , In hot climates, the high evaporation rate makes the soil really dry. Transpiration is loss of water by the plant by evaporation, chiefly from the minute pores or stomata on the leaves. 13. At one time almost the whole of the salt in commerce was produced from the evaporation of sea water, and indeed salt so made still forms a staple commodity in many countries possessing a seaboard, especially those where the climate is dry and the summer of long duration. , $MMT = window.$MMT || {}; $MMT.cmd = $MMT.cmd || [];$MMT.cmd.push(function(){ $MMT.display.slots.push(["45ba4f61-76ac-4b3d-94d4-c9019d2ebe3c"]); }), $MMT = window.$MMT || {}; $MMT.cmd = $MMT.cmd || [];$MMT.cmd.push(function(){ $MMT.display.slots.push(["418b1e7b-a189-47b4-952a-43e52a926ad5"]); }), $MMT = window.$MMT || {}; $MMT.cmd = $MMT.cmd || [];$MMT.cmd.push(function(){ $MMT.display.slots.push(["9b588b9a-598a-47f4-bc83-ba2fd303e5df"]); }).
Some streams wholly dry up in the dry seasons, and in the foot-hills and sand-hills there are a few that disappear by sinking or evaporation. Transpiration sentence examples. Where the surface is ulcerated it may be protected from external violence and placed under favourable conditions for healing by covering it with lint moistened with water and with oil-silk over it to prevent evaporation. In the straits joining it with the Atlantic and the Black Sea the fresher surface waters of these seas flow inwards to assist in making good the loss by evaporation at the surface of the Mediterranean, and in both cases dense water makes its way outwards along the bottom of the channels, the outflowing currents being less in volume and delivery than the inflowing. We give it from a Goldman halothane vaporizer in series with a halothane vaporizer in series with a halothane vaporizer, using a gauze in the bowl to increase evaporation. , We triggered evaporation when we heated the liquid in the lab. Evaporation then continues at the constant temperature T, abstracting heat from the substance outside the refrigerator as shown by the line BC. To avoid reading evaporation lines, read the results of your test within the recommended time frame. The principal feature in the circulation in the depths of the Indian Ocean is a slow movement of Antarctic water northwards along the bottom to take the place of that removed from the surface by evaporation, and by currents in the lower latitudes. In the case of a large hollow in a very dry climate the rate of g evaporation may be sufficient to prevent the water from ever rising to the lip, so that there is no outflow to the sea, and a basin of internal drainage is the result.
During the rainy season there is a considerable body of water in these channels, but owing partly to rapid evaporation and partly to the porous character of the soil the surface of the country dries rapidly. In the central and southern portions of the plateau the streams either flow into salt lakes, where their waters pass off by evaporation, or into freshwater lakes, which have no visible outlets. The test tube is tightly corked to prevent evaporation, and allowed to stand for some hours. The evaporation slightly increases as the rainfall increases, but at nothing like so high a rate. at atmospheric pressure water will absorb about 760 times its own volume of ammonia vapour), and this produces an evaporation from the liquid in the vessel previously used as a condenser. Some of the saline springs yield salt enough to render their evaporation profitable. The oceans are the major source of the atmospheric moisture that is obtained through evaporation. Evaporation and subsequent distillation under a high vacuum gives crude glycerin. Cobalt nitrate, Co(NO 3) 2.6H 2 0, is obtained in dark-red monoclinic tables by the slow evaporation of a solution of the metal, its hydroxide or carbonate, in nitric acid. If foodstuffs are to be employed it must be possible to grow them in excess of food requirements, and at a cost low enough to ensure that the price of the alcohol shall be about the same as that 1 The lower calorific value plus the latent heat of evaporation at constant volume. The second method may be called the method of evaporation. That evaporation in vacuo, in a multiple-effect evaporator, is advantageous by reason of the increased amount of sugar obtained from a given quantity of juice, and by reason of economy of fuel, there is no doubt, but whether such an apparatus should be of double, triple, quadruple or quintuple effect will depend very much on the amount of juice to be treated per day, and the cost of fuel. The free acid has not been isolated, since on evaporation the solution gradually loses sulphur dioxide. It slows down evaporation of water to guard against dehydration. The process of natural evaporation in the salines or salt gardens of the margin of warm seas made the composition of sea-salt familiar at a very early time, and. , Evaporation worsens the drought by removing water from the lake. In estimating the evaporation to be deducted from the rainfall for the purpose of determining the flow into a reservoir, it is important to bear in mind that the loss from a constant water surface is nearly one and a half times as great as from the intermittently saturated land surface. During the three years he held this position he carried out researches on the contact of elastic solids, hardness, evaporation and the electric discharge in gases, the last earning him the special commendation of Helmholtz. The amount required to combine chemically with the cement is about 16% by weight, but in practice much more than this is used, because of loss by evaporation, and the difficulty of ensuring that the water shall be uniformly distributed. In the summer a great accumulation of solar heat takes place on the dry surface soil, from which it cannot be released upwards by evaporation, as might be the case were the soil moist or covered with vegetation, nor can it be readily conveyed away downwards as happens on the ocean. annually, but the drainage from the eastern slopes of the Andes is large enough to meet the loss from evaporation and keep these inland lakes from drying up. An economical method of evaporation must be found. The use of multiple-effect evaporation made it possible to raise the steam for all the work required to be done in a well-equipped factory, making crystals, under skilful management, by means of the bagasse alone proceeding from the. sebum levels and high moisture evaporation rates.