A balloon sits fully inflated, its rubber skin stretched smooth and shiny. Held by a string or resting lightly, it maintains a perfect round shape. Air inside presses outward evenly, balanced by the thin material holding it in.
This form stays steady through ordinary handling, the surface taut but intact.
The threshold arrives the instant the rubber splits open from a prick or excess stretch.
Before the split, the balloon holds as a firm, air-filled orb. The moment it tears, a sharp pop sounds as air blasts free, and the shape collapses flat in seconds, leaving wrinkled scraps.
The change marks the line from contained pressure to sudden release.