Bacteria in the milk can also cause it to curdle.
Gregpix
Vinegar makes milk curdle and the nature of vinegar is to not mix.
Boiling it makes no difference to its acidity.
Bookstores or online booksellers have sections on physics, chemistry, and science projects.
It's the same kind that makes milk spoil and curdle, but it's still good for you when it's in yogurt.
the acidity and chemicals in coke are strong enough to reverse the displacement reaction
Excess stomach acidity causes a burning sensation.
lime added makes up nutriants the leech from soild and blance high acidity
Asia
pH level, the lower the number, the more acidic (down to 1), the higher, the more base (up to 14), water is at 7. Acidity and base level is what makes food sour or bitter, respectively.
Room temperature IS room temperature, you question makes no sense.
Hydrogen as gas is neutral; acids contains hydrogen and the ion H+ is a sign of acidity.