Ice cubes float in water because they’re less dense than the liquid. But a newfound type of ice has a density nearly equal to what’s in your water glass, researchers report in the Feb. 3 Science. If you could plop this ice in your cup without it melting immediately, it would bob around, neither floating nor sinking.
The new ice is a special type called an amorphous ice. That means the water molecules within it aren’t arranged in a neat pattern, as in normal, crystalline ice. Other types of amorphous ice are already known, but they have densities either lower or higher than water’s density under standard conditions. Some
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