How did the first fridge keep food cool?

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The first fridges used ammonia and an electrical pump which would forced the liquid through tubes that ran along the back of the refrigerator. With time the moving parts involved in the electrical pumps would cause breaks in the tubes or the pump itself and the ammonia would leak into the home, often causing death to the family. In the 1920's Einstein, for this very reason invented the very first pump with no moving parts also known as the electromagnetic pump. This was then used to pump the ammonia until Freon gas (Chloro-Fluoro-Carbon). As it is more efficient and safer.


The actual cooling of the food is related to the second law of thermodynamics. As long as the tubes filled with ammonia are cooler than the food within the fridge, the heat will constantly move from the food to the cold tubes until it reaches a temperature equilibrium.
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How do fridges keep things cool?

Refrigerators keep their interiors cool by transferring heat out of the interior of the system to the outside. In reality the total system (the inside of the refrigerator and the room it's in) winds up with more heat but the part we want cold has less heat energy. A bit confusing, but lets step thro ( Full Answer )

Should cooked food be cooled down before putting in the fridge?

Not necessarily. Supposedly modern refrigerators can handle the chilling of hot food. But personally, I help it out, either by separating the food into smaller, shallower storage containers to permit faster chilling or by using ice baths to cool the food down. The FDA Food Code says that food sho ( Full Answer )

How long can you keep potatoes in the fridge?

\nPotatoes should never be kept in the fridge because the starch in them will turn to sugar. Kept in a dry, dark place at room temperature they will last between 1-2 months. When they go bad, you will be able to tell by their softness and wrinkles on the skin.

Can you keep a thermos in the fridge?

I wouldn't see any reason why you couldn't keep a thermos in the refrigerator. Pre-chilling containers for cold beverages is a good idea anyway..

How long does soup keep in the fridge?

Generally a soup can be safe to eat for three to four days if ithas been properly refrigerated. Soup that has been frozen can lastfrom two to three months.

How does the fridge keep food cold?

\n. \nit compresses air in the pipe's behind the fridge and places it into chamber, to keep it cold it takes air from within the fridge and re-compresses it.A refrigerator will keep food cold by converting gas into liquid, then liquid into vapour. Basic physics maintains that when two surfaces come ( Full Answer )

How long will pie keep in the fridge?

It depends on the pie, but generally it's a good idea to throw out any prepared food that is older than four days, particularly if the dish includes meat or dairy products. Even if the pie should be technically safe to eat after four days, the quality of many pies so severly deteriorates after this ( Full Answer )

How long does fish keep out of the fridge?

You should keep foods out of the danger zone to prevent bacteria from forming on foods. Bacteria can form on foods in the danger zone after just an hour. The danger zone is under 145 degrees and over 45 degrees.

How long can you keep jello OUT of the fridge?

Foods that are left out in room temperature for more than an hour can begin bacteria growth. Our stomach acids can kill some of these bacterias but not all and some can make you very sick. Keep foods OUT of the danger zone- Above 45 degrees and Below 145 degrees. Between these temperatures bacteria ( Full Answer )

How long does kielbasa keep out of the fridge?

I'm not sure. I left some out l;ast night, from 2pm - 930 am next dat by accident and it SEEMS to be ok. I tasted it and tasted fine and no funny smell. Although apartment was fairly air conditioned, still am surprised. Hope I don't get sick eating it because I like kielbasa with my eggs and hashbro ( Full Answer )

How long will quiche keep in the fridge?

Meats are kept better in the freezer. Meats can be kept in the refrigerator for 3 to 4 days if raw and 1 to 2 days longer if cooked. Always place cooked meats in an airtight container.

How long will cheese keep in the fridge?

Months, if the pack is unopened.\n. \nAfter it has been opened it will develop mold over a few weeks. This mold can usually be cut off and the rest eaten.

How long will deer keep in the fridge?

Meats are kept better in the freezer. Meats can be kept in the refrigerator for 3 to 4 days if raw and 1 to 2 days longer if cooked. Always place cooked meats in an airtight container.

How does the food in a fridge cool down?

Freon is run through copper tubing in a refrigerator chilling the air inside the insulated box that makes up a refrigerator The temperature drops, chilling anything inside.

Can you put hot food straight into the fridge or does it have to cool down first?

It has to cool down or the whole fridge will get warm.. Another Answer . Supposedly, modern refrigerators can handle hot food without a negative impact on other food in the fridge. Personally, I would let the food cool so that it is no longer steaming before placing it in the fridge. The food ( Full Answer )

How long can you keep pickles in fridge?

Homemade pickles if kept in the fridge, can be kept for about 2 months. Store bought pickles if kept in the fridge, can be safely kept for about a year. Here's a good website to check out... www.stilltasty.com

How many days you can keep food in fridge?

Food will only last a few days in the refrigerator. Most foods will last about 5 days in the refrigerator if the food is stored properly. Place the food in an air tight container for the best results. You can transfer the food to the freezer if longer storage is needed.

Why does food keep longer in a fridge?

Bacteria lives better at warm temperatures. Colder temperatures keep bacteria from forming on foods. It is important to keep foods out of the bacteria living temperature.

Should you keep batteries in the fridge?

When left unused, some batteries discharge quickly and some do not. This is true of both single use batteries and rechargeable batteries. Discharge is a chemical reaction and chemical reactions are slower at lower temperatures. Refrigerated batteries are stored at a lower temperature, so some type ( Full Answer )

How do you keep worms fresh in the fridge?

You put them in a styrofoam container.. I didnt think u could keep worms in a fridge, To keep worms fresh and lasting longer . What u will need is a Jar or bucket some old news paper and moss from your garden.. Step 1.. Cut up and wet some of the paper and place it in the bottom of the jar or buc ( Full Answer )

Should you keep food open in fridge?

No, food loses moisture and dries up. And if you have some off food in your fridge, It cold spread its bacterium to other open food.

How long can you keep gammon in the fridge?

It could be stored refrigerated up to ten days. That will depend upon several factors, including the storage conditions, packaging and the quality of the gammon.

Can food keep cool underground?

Yes. The temperature is always cooler underground. There have been several people who have made underground homes and gardens. We have one in this area and it gets a 100+ in the summer, but he was able to keep his home and garden cool with no air conditioning because it was underground. Before moder ( Full Answer )

Is keeping parrot food in the fridge a good idea?

It won't cause any problems to keep parrot food in the fridge. However, it's not necessary unless you have weevils or moths that regularly get into the food. Always keep parrot food in a sealed jar or container, rather than loose in an open box.

Does cool whip have to stay in the fridge?

"Cool Whip" is mostly whipped oils, and is shipped as a frozen food. It is also kept in the freezer sections of retail stores. It should be frozen or refrigerated to prevent spoilage. Once it is opened, it must be kept cool or it will rapidly go bad. Recommended storage limits : 2 to 3 weeks refrig ( Full Answer )

Can you keep honey in the fridge?

It's not really recommended to store honey in the fridge because storing honey under a very cold temperature will destroy some enzymes that are good for the body. Plus, honey is has a high ability to absorb the smell and moisture from the surrounding. It's better to store honey jars in a dark ( Full Answer )

How do you keep a fridge odourless?

A lemon can be cut into two halves and to be placed in the egg tray..sure u will be ridden out of the bad odour

Why does food keep longer in a freezer than a fridge?

When you put food/microbes in a cold place, it slows down the bacteria growth. The colder the place, the slower the growth. Once you get to -18 degrees Celsius (average freezer temperature), bacterial action stops and food can be kept for up to 3 months because the bacteria are small (as their growt ( Full Answer )

Where is the cooling element in a fridge?

Domestic compression cycle refrigerators transfer heat from the inside of the cabinet to the outside while generating a few hundred Watts of additional heat in the process. An evaporator (which is usually formed from Aluminum, and resembles a radiator) is located in the freezer compartment. This is ( Full Answer )

How long should cooked food be left to cool before placing in the fridge?

The main reason to let the food cool before refrigerating is so that it doesn't bring foods near it up in temperature. If the food is fresh from the cooking (boiling hot) It can safely sit out for an hour or so before putting it in the fridge. If your fridge isn't full and you can put the food on an ( Full Answer )

How long does an omelet keep in the fridge?

Its hard to say. It really depends on what is in it because obviously some foods keep better than others. I would say roughly two days but the sheer smell will drive it out of your refrigerator in about a day. For the best results, freeze it and reheat it slowly in the oven.

Do you keep honey in the fridge?

You can, but it's not necessary. Most people store honey at room temperature in a dark location, like a cupboard.

How long does celery keep in the fridge?

Celery is great for your body. If you cut off about an inch and a half from the bottom, and the leafy part at the top, it can easily last for two weeks in properly cooled fridge. As it starts to age, it loses its crispness, so before each use, check to see that its crisp, and not floppy.

How long can you keep rice for in the fridge?

Cooked rice should be kept n a fridge for no longer than one day. Cooked rice is a night risk food group for food poisoning and therefore it would be better to cook a fresh batch of rice rather than use pre-cooked rice. However, if you have bought the rice pre-packed and part cooked, it will have be ( Full Answer )

Why does a fridge not cool food properly if they are tightly packed together?

Because the cooling depends on the circulation of chilled air over,under, around, and between the various packages, tubs, jugs, cans, and bottles onthe shelves. If everything is packed together tightly, then nothing in themiddle can cool until everything around it has cooled, and its own heat has co ( Full Answer )