why doesn't milk stay good out of the fridge?

Answer 1

When milk is left standing out for a while, it turns sour. This is the result of fermentation: lactic acid bacteria turning the milk sugar into lactic acid. This fermentation process is exploited in the production of various dairy products such as cheese and yogurt. There are four noted periods of milk decay:

Rancid (also called "on the turn". Milk is still consumable at this stage)
Curdling (separation of curd and whey will occur but may still be consumable)
Coagulation (beyond use. A period of aromatic decay sets in accompanied by mould)
Dry (beyond use. The milk has dehydrated and become hard and chalky)

Answer 2

When raw milk is left standing for a while, it turns sour. This is the result of fermentation: lactic acid bacteria turning the milk sugar into lactic acid. This fermentation process is exploited in the production of various dairy products such as cheese and yogurt. There are four noted periods of milk decay:

Rancid (also called "on the turn". Milk is still consumable at this stage)
Curdling (separation of curd and whey will occur but may still be consumable)
Coagulation (beyond use. A period of aromatic decay sets in accompanied by mould)
Dry (beyond use. The milk has dehydrated and become hard and chalky)
Pasteurized cow's milk, on the other hand, spoils in a way that makes it unsuitable for consumption. This causes it to assume an unpleasant odor and pose a high danger of food poisoning if ingested. The naturally-occurring lactic acid bacteria in raw milk, and under suitable conditions, quickly produce large amounts of lactic acid. The ensuing acidity in turn prevents other germs from growing, or slows their growth significantly. Through pasteurization, however, these lactic acid bacteria are mostly destroyed, which means that other germs can grow unfettered and thus cause decomposition.

In order to prevent spoilage, milk can be kept refrigerated and stored between 1 and 4 degrees Celsius in bulk tanks. Most milk is pasteurized by heating briefly and then refrigerated to allow transport from factory farms to local markets. The spoilage of milk can be forestalled by using ultra-high temperature (UHT) treatment; milk so treated can be stored unrefrigerated for several months until opened. Sterilized milk, which is heated for a much longer period of time, will last even longer, but also lose more nutrients and assume a still different taste. Condensed milk, made by removing most of the water, can be stored for many months, unrefrigerated. The most durable form of milk is milk powder which is produced from milk by removing almost all water.

Answer 3

Heat speeds up a reaction. The milk will eventually spoil no matter what temperature you keep it at; but the warmer the milk is the faster the reaction (milk spoiling and growing bacteria) occurs. If you keep milk in the fridge it wont spoil as fast as it will if you leave it out, but it will spoil.

Answer 4

when the milk starts to go to room temperature it begins to produce bacteria anything that belongs in the fridge should not be out of the fridge than 20 minutes to remain safe

Answer 5

Milk is a perishable commodity and spoils very easily. Its low acidity and high nutrient content make it the perfect breeding ground for bacteria, including those which cause food poisoning (pathogens).

Answer 6

If you take whole, organic milk, mix it with Kefir starter, and let it sit for 12-18 hours, it's delicious. Thick like buttermilk, but sweeter. Drink it by itself, or make smoothies with it.

I also set whole organic milk out till it separates, strain it, and have delicious cream cheese.

Answer 7

Micro organisms develope at the room temp. which spoil milk .In d fridge the temp. is low and micro-organisms can't survive at extreme temp.thats why its best when u boil it at first and then store it in fridge.Thats kinda what is done in pasturisation.

Answer 8

in the warm temp bacteria can multiply and spoil the food faster whereas in cold tempratures they are dormant which is why anything kept inside the refrigerator stay good for a longer period than it does outside

Answer 9

temperature sours the milk

Answer 10

Because it can spoil and decay....warm milk isn't that good for people's hearts and arteries.