Why Rainbow Cocktails Hold Their Layers
Pretty is not the point. In a clear glass, red syrup settles beneath paler spirits because density, measured as mass per unit volume, lets gravity sort liquids before diffusion can erase their boundaries. The colors merely report it. What looks like decoration is hydrostatics, caught briefly between a pour and a stir.The spectacle is honest. When a pour is slowed over the back of a spoon, it creat...More
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