. Cyclopedia of farm animals. Domestic animals; Animal products. 238 REFRIGERATION OF DAIRY PRODUCTS â¢f~ '"â¢â¢â¢â¢ v'gKriaa? 'â '''J'Wl''ll'>''''/'J'^-' 'â¢-'< K^r" *'SHAVINGS' is necessary to bring the air into circulation in order to produce a cooling effect. Bacteriology applied to refrigeration.â Decay is due to the disintegration of material by inherent ferments or by bacteria. Bac- teria are micro- scopic livingor- ganisms which actundercondi- tions similar to large organ- isms, namely, where there is food, moisture and warmth. Some ferments do not grow at all at freezi
. Cyclopedia of farm animals. Domestic animals; Animal products. 238 REFRIGERATION OF DAIRY PRODUCTS â¢f~ '"â¢â¢â¢â¢ v'gKriaa? 'â '''J'Wl''ll'>''''/'J'^-' 'â¢-'< K^r" *'SHAVINGS' is necessary to bring the air into circulation in order to produce a cooling effect. Bacteriology applied to refrigeration.â Decay is due to the disintegration of material by inherent ferments or by bacteria. Bac- teria are micro- scopic livingor- ganisms which actundercondi- tions similar to large organ- isms, namely, where there is food, moisture and warmth. Some ferments do not grow at all at freezing. To illustrate this and to show its practical working, we will suppose that air is cooled by ice to MS" Fahr. At this temperature it will hold less water than at 50° Fahr. If at 50° Fahr. it was saturated 90 per cent, at 38° it would have more water than it could carry. The excess would be condensed and deposited on the ice. This is well illustrated in warm weather when a glass of cold water is drawn, when the outside of the glass quickly becomes cov- ered with moisture and is said to "; This moisture comes from the air because the air imme- diately surrounding the glass is cooled to a point where it is saturated, and the excess of water is condensed on the cold surface of the glass. In just the same way rain is brought about, and the excess of moisture of the air in the refrigerator is depos- ited on the ice. This cold air, now being heavier, drops down and produces a vacuum, which throws the other and warmer air on the ice. Dryness ?s Fig. 263. Section showing insulation for a frame building. temperatures, and the few that do, develop very slowly. This is why refrigeration pre- serves perishable products. When conditions are such that moisture, to a certain extent, can be withheld, the preservation can be brought about by higher temperature. This can be applied only on such products as are not liquid, such as butter and cheese. I
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