Though, as has simply been identified, moisture is required for the expansion of some micro-organisms, each moisture and heat are crucial for the expansion of a lot of the organisms that trigger molding, putrefaction, and fermentation. It’s undoubtedly recognized, additionally, that in winter or in chilly climates meals could be stored for lengthy durations of time with none obvious change; actually, the decrease the temperature the much less doubtless are meals to spoil, though freezing renders a lot of them unfit to be used. These information are what led as much as the scientific reality that preserving meals dry and at a low temperature is an efficient and handy methodology of stopping them from spoiling and to the invention of the fridge and different gadgets and strategies for the chilly storage of meals.

THE REFRIGERATOR.–For dwelling use, the fridge affords essentially the most handy technique of preserving meals in good situation. As is well-known, it’s a gadget that, by the use of air cooled by the melting of ice or in another method, retains meals at a temperature close to the freezing level. All fridges are constructed in an analogous method, having two or extra layers of wooden between which is positioned an insulating materials, corresponding to cork, asbestos, or mineral wool. The meals compartments are lined with tile, zinc, or different rust-proof materials, and the ice compartment is often lined with rust-proof steel, in order to be water-tight and unbreakable. Any fridge could also be made to serve the aim of preserving meals successfully whether it is properly constructed, the ice chamber stored as filled with ice as potential, and the housewife is aware of find out how to prepare the meals within the meals chambers to the very best benefit.

The development and use of fridges are primarily based on the well-known scientific undeniable fact that air expands and rises when it turns into heat. This may be proved by testing the air close to the ceiling of a room, for irrespective of how heat it’s close to the ground it’s going to all the time be hotter above. The identical factor happens in a fridge. As air is available in contact with the ice, it’s cooled and falls, and the nice and cozy air is pressured up. Thus the air is stored in fixed movement, or circulation.

Many fridges are constructed with the ice compartment on one facet. In such fridges, there’s often a small meals compartment straight underneath the ice chamber, and that is the coldest place within the fridge. Right here needs to be saved the meals that want particular care or that take in odors and flavors readily, corresponding to milk, butter, cream, meat, and so on., as a result of at this place the air is the purest. The meals that give off odors sturdy sufficient to taint others needs to be stored on the higher cabinets of the fridge, via which the present of air passes final earlier than being free of odors by passing over the ice.

One other kind of fridge is one by which the ice chamber, or compartment, extends throughout the complete high. This kind is so constructed as to provide on all sides a present of air that passes down from the ice on the heart and again as much as the ice close to the skin partitions, as proven by the arrows. A unique association is required for the meals in this type of fridge, these which give off odors and flavors being positioned within the backside compartment, or farthest from the ice, and people which take up odors and flavors, on the highest shelf, or nearest the ice.

CARE OF FOOD IN REFRIGERATOR.–The correct inserting of meals in a fridge is extraordinarily essential, however sure precautions needs to be taken with regard to the meals itself. Cooked meals ought to by no means be positioned within the fridge with out first permitting them to chill, for the steam given off when a dish of sizzling meals is available in contact with the chilly air makes the fridge damp and causes an undue waste of ice by warming the air. All dishes containing meals needs to be wiped dry and punctiliously lined earlier than they’re positioned within the fridge, in order to maintain pointless moisture out of it. As butter and milk are more likely to grow to be contaminated with odors given off by different meals, they need to be correctly protected if there’s not a separate compartment by which to maintain them. The milk bottles ought to all the time be closed and the butter rigorously wrapped or put in a lined receptacle. Onions, cabbage, and different meals with sturdy odors, when positioned within the fridge, needs to be stored in tightly closed jars or dishes, in order that the odors is not going to escape. Earlier than recent fruits and perishable vegetables–that is, greens that decay easily–are put into the fridge, they need to be rigorously seemed over and all decayed parts faraway from them. No meals needs to be positioned within the ice chamber, as a result of this may trigger the ice to soften unnecessarily.

CARE OF THE REFRIGERATOR.–It’s important that each one elements of the fridge be stored scrupulously clear and as dry as potential. To perform this, nothing needs to be allowed to spoil in it, and something spilled within the fridge needs to be cleaned out instantly. The meals which can be left over needs to be rigorously inspected each day, and something unlikely for use inside a day or so needs to be disposed of. At the very least as soon as per week the meals needs to be faraway from all compartments, the racks taken out, the drain pipe disconnected, and every half completely washed, rinsed with boiling water, and dried. The within of the fridge ought to likewise be washed, rinsed, and wiped dry, after which the drain pipe needs to be related, the cabinets put again in place, and the meals changed.

The ice chamber of the fridge must also be cleaned continuously, the very best time to do that being when the ice has melted sufficient to be lifted out conveniently. To stop the ice from melting quickly when it’s out of the fridge, it might be wrapped in paper or a chunk of outdated blanket, however this protecting have to be eliminated when the ice is changed within the chamber, with a view to enable the ice to soften within the fridge. In any other case, it will be unimaginable to sit back the fridge correctly, the temperature remaining the identical as that outdoors, for it’s because the ice regularly melts that the air within the fridge turns into cool. After all, each effort needs to be made to maintain the ice from losing. Subsequently, whereas the fridge needs to be stored in a handy place, it shouldn’t be uncovered to too nice warmth; additionally, the doorways needs to be stored tightly closed, and, as has already been defined, sizzling meals shouldn’t be put in till they’re sufficiently cooled. Consideration have to be given to the care of the fridge, for under when it’s clear and dry can the expansion of micro organism that assault meals be prevented.