The Science of Soft Serve

Soft serve is a classic sweet treat that has been enjoyed since the 1940s. As anyone who has ever stopped by a Mister Softee can attest to, although it is definitely ice cream, it’s a bit different from what you might buy in a grocery store. There are several competing claims about who first invented soft serve–Tom Carvel, the Dairy Queen family and even Margaret Thatcher are all names that come up. But wherever it came from, here’s how it works:

It shares a lot with regular ice cream

In its purest form soft serve is basically just regular ice cream at a different point in its process, according to the University of Guelph. After the ice cream ingredients are mixed together, the university writes, a machine “both freezes a portion of the water and whips air into the frozen mixture.” Ice cream is between 30 and 60 per cent air–without it, you’d crack your teeth on an ice cube made of dairy. At this point in the process, if the mixture is drawn into a cone, it’s soft serve. If it’s put into a tub and frozen until it’s even colder, it becomes ice cream.

Source : https://www.smithsonianmag.com/smart-news/science-soft-serve-180964516/
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