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It depends on the food. But food and safety laws state dairy should be kept at 40F or below.
Food that wouldn't be eaten should be put in the fridge for preservation reasons. The fridge will help keep the food fresh with the low temperature. The covering of the food also helps by keeping air (oxidation) out from the food.
simply to keep food fresh. If the fridge's temp is too high, food will warm to room temperature and go off faster. Too cold, then the food will freeze! Everytime you open the fridge door you are letting room temperature air inside, increasing the temperature of the air inside the fridge, therefore the fridge (if automatic) will measure the temperature and make the air to the right temperature.
Food must be room temperature before you put it in the refrigerator otherwise it will heat up the other items in the fridge increasing bacteria which could cause food poisoning
Food can be defrosted under cold water, or in the microwave (although microwave settings vary), or ideally in the refrigerator.
in the refrigerator
You can refreeze any food after its been defrosted as long as you cook it. What you should never do is defrost food and then freeze it again raw. It's very dangerous to do that.
This food will keep for about 1 to 2 days in the refrigerator. Place the food in an air tight container for the best results. This food can easily be transferred to the freezer for longer storage time.
To insure thorough cooking of the food item.
If food in your fridge ends up frozen, you have the temperature set too cold.
According to the Global HACCP (Hazard Analysis Critical Control Point) management system, food should be place in the refrigerator after use to cool as quickly as possible.