cu in

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Definition
  1. Noun:
    • A unit of volume: "cu in" is an abbreviation for "cubic inch." It represents the volume of a cube whose sides each measure one inch in length. This is a standard unit of measurement in the imperial and US customary systems.
Usage
  • "Cu in" is used as a written abbreviation, primarily in technical, engineering, and scientific contexts to specify volume. It is less common in everyday spoken language, where "cubic inch" or "cubic inches" is used.
  • It is typically placed after a numerical value.
Examples
  • Noun:
    • The engine has a displacement of 350 cu in. (The engine's internal volume is 350 cubic inches.)
    • Please calculate the volume of the box in cu in. (Please calculate the box's volume using cubic inches as the unit.)
    • One liter is approximately 61.02 cu in. (One liter is roughly equal to 61.02 cubic inches.)
Advanced Usage
  • Technical Specifications: Commonly used to describe the displacement of internal combustion engines (e.g., in automobiles, motorcycles).
    • The classic muscle car was powered by a 426 cu in V8 engine.
  • Material Volume: Used in manufacturing and construction to specify the volume of materials or components.
    • This foam packaging has a volume of 120 cu in.
Variants and Related Words
  • Cubic inch (n): The full, non-abbreviated form of "cu in."
    • The formula requires the volume in cubic inches.
  • in³ (n): A mathematical notation equivalent to "cu in," where the superscript "3" denotes "cubic."
    • The container's capacity is 50 in³.
Synonyms
  • Cubic inch: The direct, unabbreviated synonym. There is no different word with an identical meaning in the imperial/US system for this specific unit.
Notes
  • Conversion: One cubic inch (1 cu in) is exactly equal to approximately 16.387064 cubic centimeters (cm³) or milliliters (mL).
  • Context: The abbreviation "cu in" is almost exclusively used in writing. In speech, the full term "cubic inch(es)" is always used. It is not used idiomatically or in phrasal verbs.
Noun
  1. the volume equal to a cube one inch on each side

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