# Piece (unit of measure)

Piece is a unit of measure that is used in many areas of technology and everyday life and means a defined number (number of pieces) of a certain thing (unit symbol St, Stk or Stck, symbol: n ).

In cost accounting , work planning and work preparation as well as in other areas of economic information is per piece such. B. Production time per piece, price per piece ( unit price ) usual. In packaging technology , the number of items is used to indicate the goods contained in a package .

Multiples of the number of pieces (also number of pieces) one are used to define further units of measure, such as B. for the couple, the six-pack or the dozen.

The SI unit of the amount of substance , the mole , which is frequently used in the natural sciences, especially in chemistry , has also been defined as a number of items since May 20, 2019: 1 mole corresponds exactly to the number of items . In words, that's roughly 602 trillion . ${\ textstyle 6 {,} 022 \, 140 \, 76 \ cdot 10 ^ {23}}$

Some old counting measures (outdated units of measure) that are based on the piece are e.g. B.

• 60 pieces = 5 dozen = 1 shock
• 144 pieces = 1 dozen × 1 dozen = 1 gros

In the trade in wood , such as staves and barrel timbers, two different quantities were expected in Riga : 60 pieces were the wrecked shock and 62 pieces were the unracked shock . In the case of spruce boards and planks, the unshackled shock had 64 pieces and the wrecked shock 60 pieces. The shock oak planks had 60 Kraveelen. The dimensions for a Kraveele ranged from 2½ inches thick and 24 feet long to 4½ inches thick and 9 feet long.