octane number

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octane number

A scientist compares the octane number of two fuel samples in a laboratory.

Definition

Noun: A numerical value that represents the resistance of a gasoline fuel to knocking or pinging in an internal combustion engine. It is a standard measure of fuel performance and quality.

Usage

The octane number is a critical specification for gasoline. A higher octane number indicates a greater resistance to engine knock, which is an undesirable premature combustion of the fuel-air mixture. This allows engines with higher compression ratios to operate efficiently.

Examples
  • Noun:
    • Premium gasoline typically has a higher octane number than regular unleaded fuel.
    • The engineer checked the fuel's octane number to ensure it was suitable for the high-performance engine.
    • A car's owner's manual will specify the minimum required octane number for optimal operation.
Advanced Usage
  • Research Octane Number (RON) and Motor Octane Number (MON): These are two different test methods for measuring a fuel's anti-knock properties. The octane number displayed on fuel pumps in many regions is an average of these two, called the Anti-Knock Index (AKI) or (R+M)/2.
    • The fuel was tested, yielding a RON of 95 and a MON of 85, resulting in a pump octane number of 90.
Variants and Related Words
  • Octane rating: A common synonym for octane number.
    • What is the octane rating of this fuel?
  • Knock resistance: A descriptive term for the property measured by the octane number.
  • Anti-Knock Index (AKI): The specific average of RON and MON used as the posted octane number in North America.
Synonyms
  • Octane rating
  • Fuel grade (in a contextual sense referring to the octane level)
Related Phrases and Terms
  • "High-octane": An adjective often used metaphorically to describe something as intense, powerful, or energetic, derived from the technical meaning.
    • The debate was a high-octane clash of ideas.
  • Engine knock / pinging: The undesirable condition that a sufficient octane number prevents.
  • Compression ratio: An engine design factor that determines the required octane number of the fuel.
octane number

A scientist compares the octane number of two fuel samples in a laboratory.

Noun
  1. a measure of the antiknock properties of gasoline

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