melting frozen tea

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I often freeze tea in a plastic container. When I take it out and leave it for a while, I observe that it melts very very slowly, and it makes a very small amount of thick liquid tea. After taking a few sips every now and then and almost running out of tea, I now have a big chunk of just ice. How does the tea “get out” of the ice, and why does the ice not melt quickly?

In: 3

Only the surface of an ice block will melt because it’s the only part that is in contact with the warmer air. The inside of the ice can’t melt until the outer layers melt away first.

Water/tea is isn’t “getting out” of the ice. It’s melting from the outside in.

Water that has less dissolved solids in it will freeze first, and defrost last, compared to water with more dissolved solids. Even though you might think your tea is fully mixed, it’s never really a perfect mix of ‘one tea particle per ml’ in the whole container.

So as it’s defrosting, the bits that contain more tea inside will defrost first, leaving you with more pure water later

Milk does the exact same thing and you can end up with super concentrates fatty milk, plus… An ice block.