"The reason that coasters stick to the bottom of your drink is that two smooth surfaces - the coaster and the glass - become temporarily glued together by the surface tension of water. As condensation drips down the side of the glass, it fills the gap between the coaster and the drinking vessel, and when you pick it up, it actually creates a vacuum, holding the two surfaces together."
"The stickiest materials for coasters are also the smoothest. While they certainly look nice, materials like glass, polished stone, resin, metal, and glazed ceramics are among the worst offenders. Pair them with a smooth-bottomed glass and a warm, humid day when condensation is at its worst and you're asking for trouble. Fortunately, there are lots of other coasters and glasses that won't give you the same problems."
Smooth coasters and smooth-bottomed glasses can adhere due to surface tension when condensation fills the gap and creates a temporary vacuum, holding them together. Materials such as glass, polished stone, resin, metal, and glazed ceramics are particularly prone to sticking. Warm, humid conditions increase condensation and the problem. Prevent sticking by using coasters or glasses with textured or absorbent surfaces, swapping smooth materials for options that disrupt the water seal. Changing coasters or glassware avoids accidental spills, protects garments, and keeps coasters from flying when lifted. Choosing appropriate materials is a simple fix when organizing a home bar.
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