Bowling pin in the context of Metastable state

In chemistry and physics, metastability is an intermediate energetic state within a dynamical system other than the system's state of least energy.A ball resting in a hollow on a slope is a simple example of metastability. If the ball is only slightly pushed, it will settle back into its hollow, but a stronger push may start the ball rolling down the slope. Bowling pins show similar metastability by either merely wobbling for a moment or tipping over completely. A common example of metastability in science is isomerisation. Higher energy isomers are long lived because they are prevented from rearranging to their preferred ground state by (possibly large) barriers in the potential energy.

During a metastable state of finite lifetime, all state-describing parameters reach and hold stationary values. In isolation:

Bowling is a target sport and recreational activity in which a player rolls a ball toward pins (in pin bowling) or another target (in target bowling). Most references to bowling are to pin bowling, specifically tenpin bowling, played in the United Kingdom and Commonwealth countries. Bowling can also refer to target bowling, such as lawn bowls. Bowling is played by 120 million people in more than 90 countries, including 70 million people in the United States alone.

In pin bowling, players knock over pins on a long smooth surface called a lane. Lanes have a wood or synthetic surface with protective lubricating oil applied in different oil patterns that affect ball motion. A strike is achieved when all the pins are knocked down on the first roll, and a spare is achieved if all remaining pins are knocked over on a second roll. The most common variation of pin bowling is tenpin; other variations include candlepin, duckpin, nine-pin (kegel), and five-pin. The historical game skittles is the forerunner of modern pin bowling.

Tenpin bowling is a type of bowling in which a bowler rolls a bowling ball down a wood or synthetic lane toward ten pins positioned evenly in four rows in an equilateral triangle. The goal is to knock down all ten pins on the first roll of the ball (a strike), or failing that, on the second roll (a spare). While most people approach modern tenpin bowling as a simple recreational pastime, those who bowl competitively, especially at the highest levels, consider it a demanding sport requiring precision and skill.An approximately 15-foot (5 m) long approach area used by the bowler to impart speed and apply rotation to the ball ends in a foul line. The 41.5-inch-wide (105 cm), 60-foot-long (18 m) lane is bordered along its length by gutters (channels) that collect errant balls. The lane's long and narrow shape limits straight-line ball paths to angles that are smaller than optimum for achieving strikes; accordingly, bowlers impart side rotation to hook (curve) the ball into the pins to increase the likelihood of striking.

Oil is applied to approximately the first two-thirds of the lane's length to allow a "skid" area for the ball before it encounters friction and hooks. The oil is applied in different lengths and layout patterns, especially in professional and tournament play, to add complexity and regulate challenge in the sport. Especially when coupled with technological developments in ball design since the early 1990s, easier oil patterns common for league bowling enable many league bowlers to achieve scores rivaling those of professional bowlers who must bowl on more difficult patterns—a development that has caused substantial controversy.

A bowling ball is a hard spherical ball used to knock down bowling pins in the sport of bowling.

Balls used in ten-pin bowling and American nine-pin bowling traditionally have holes for two fingers and the thumb. Balls used in five-pin bowling, candlepin bowling, duckpin bowling, and European nine-pin bowling have no holes, and are small enough to be held in the palm of the hand.