Why does regular milk take only a week or two to expire, while my iced coffee containing milk doesn’t expire for months?

Question

I’m specifically drinking Dunkin Donuts bottled iced coffee. It says it contains skim milk in the ingredients list.

In: Chemistry

Answer 1

Because the coffee product has been [UHT pasteurized](https://en.wikipedia.org/wiki/Ultra-high-temperature_processing) which super-duper kills off anything that could be alive in there that would cause it to go bad. Normal milk isn’t UHT pasteurized because it changes the flavor of the milk for the worse, but you don’t usually notice this when it’s been mixed in to coffee.