Cranberries float because each berry contains tiny air pockets inside its flesh.

The longer version

Buoyancy depends on average density, and a cranberry sits just below the density of water because its flesh contains small air-filled chambers around the seeds. Those pockets act like tiny flotation bladders, keeping the berry afloat even though its skin and pulp are heavier than water.

Growers take advantage of this by flooding bogs at harvest; ripe berries detach and rise to the surface, where they can be corralled and collected. The same trapped air also makes a fresh berry bounce rather than splat. Cooking collapses the structure, and the berries then sink and burst as the internal gas escapes.

Where this entry sits

Everyday ingredients turn out to be full of quiet chemistry and long history. This collection gathers short, plain explanations of how bread rises, why onions sting, where common spices originate, and how coffee, tea, and chocolate reached the modern kitchen. The full list sits on the Food and Drink page, where every entry is listed in order.