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A peck is an imperial and United States customary unit of dry volume, equivalent to 2 gallons or 8 dry quarts or 16 dry pints (9.09 (UK) or 8.81 (US) liters). Two pecks make a kenning (obsolete), and four pecks make a bushel. Although the peck is no longer widely used, some produce, such as apples, is still often sold by the peck.
1 imperial peck
= 1⁄4 of an imperial bushel
=2 imperial gallons
=8 imperial quarts
=16 imperial pints
=320 imperial fluid ounces
=9.09218 litres
≈554.839 cubic inches
≈2.06411 US dry gallons
The attoliter or attolitre is a common metric unit of volume. It is equal to 10-21 cubic meters. Plural name is attoliters.