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The milk gets infected with bacteria present in the environment, some of which produce acids and other compounds as a byproduct of their digestive process when they consume compounds present in the milk. That's what gives it the sour taste and sometimes rank smell.

If you inoculate it with the right strain of bacteria, lactobacillus acidophilus being one, you get yogurt. L. acidophilus consumes lactose, a sugar in the milk, and produces lactic acid that gives yogurt its tangy flavour.

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11y ago
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10y ago

Wine contains ethanol and upon exposure to air, it gets oxidised by the atmospheric oxygen to become ethanoic acid which gives it the sour taste.

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13y ago

Because the acids in the wine attach themselves to the Oxygen in the air changing from bitter to sour. The process is called oxidation.

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13y ago

If it spoils, wine can taste sour as it begins to turn into vinegar.

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11y ago

It turns into vinegar.

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Q: Why does milk smell sour after leaving it in an open air?
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Milk is sour because it is spoiled and how milk spoils is if you leave it out so long that it will get so spoiled and it will smell so funny that you will wanna take it out of your refrigerator. So that is why milk is so sour.[ IF YOU DISAGREE TO ANY OF THIS MAKE YOU AN ACCOUNT AND CORRECT ME AND I WILL SEE WHAT YOU SAY AND ADD THAT TO WHY MILK SPOILS].


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