Difficulty:★

How to experiment:

Make ice cream with milk and sugar. After blending them, put them in the freezer for 1 to 2 hours. What will be the result of the experiment?

Maybe you thought you'd be treated to a tub of fluffy ice cream, but what you got was something that looked neither like ice cream nor a popsicle, with white ice on the surface and unfrozen milk underneath, not unlike ice cream bought off the street.

Taste the ice on top, what flavor? It's bland. That's exactly the conclusion we were going to get from our experiment.

Knowledge extension:

Why doesn't the ice on top have a sweet flavor? It turns out that when water freezes, there is a tendency to exclude "foreign". When freezing, the water molecules to the sugar and milk crowded out. Real ice cream is constantly stirred during the production process, and if you keep stirring, you will also make delicious ice cream. Of course, very low temperatures are also a requirement.

You've never been to Antarctica, but from this experiment, can you figure out what Antarctic ice tastes like?

When seawater freezes, the salts inside the water are also crowded out and move toward warmer temperatures. Seawater is warmer than the temperature on icebergs, so when it freezes, the salts in the ice move toward the seawater. The attraction of the Earth is also an important factor, and the salt contained in the ice slowly moves downward under the force of gravity. That's why Antarctic ice is pale.

The light-flavored ice is not formed in a single day, but over years and years, before the salt in it is slowly drained out. Usually a year's worth of ice melts into water for human consumption, and after a few years the ice contains little or no salt.