absolute alcohol

Thân thiện

A scientist carefully measures absolute alcohol in a laboratory beaker.

Definition

1. Noun:
   • Pure ethyl alcohol: A highly concentrated form of ethanol, typically defined as containing no more than 1% water by volume. It is the most dehydrated form of ethanol commonly produced.

Usage

• Noun:
  • "Absolute alcohol" is a specific chemical term. It is used in scientific, industrial, and medical contexts to refer to ethanol of the highest practical purity, essential for reactions and processes where even small amounts of water would interfere.
  • It is typically handled with care due to its high flammability and hygroscopic nature (it readily absorbs water from the air).

Examples

• Noun:
  • The laboratory procedure requires absolute alcohol to ensure the reaction proceeds without interference.
  • They used absolute alcohol as a solvent to dissolve the organic compound.
  • The purity of the absolute alcohol was verified by gas chromatography.

Advanced Usage

• Technical Specification: In many official standards and pharmacopoeias, "absolute alcohol" is precisely defined, often as ethanol with a minimum purity of 99% or 99.5%.
• Distinction from "Ethanol": While all absolute alcohol is ethanol, not all ethanol is absolute alcohol. The term "absolute" specifically denotes the near-total absence of water.

Variants and Related Words

• Anhydrous ethanol: A direct synonym often used interchangeably with "absolute alcohol," emphasizing the absence of water ( means "without water").
• Ethanol (C₂H₅OH): The general name for the alcohol compound. "Absolute alcohol" is a high-purity grade of ethanol.
• Denatured alcohol: Ethanol that has been made unfit for drinking by adding other chemicals, which may or may not be of "absolute" purity.

Synonyms

• Anhydrous ethanol
• Dehydrated alcohol

Notes

• Not a Common Consumer Product: "Absolute alcohol" is not typically sold for general consumption or first-aid use (where "rubbing alcohol," which is often isopropanol, is common). It is a specialized industrial and laboratory chemical.
• Key Property: Its extreme dryness makes it useful for preserving moisture-sensitive materials and for chemical synthesis.

Học thuật

Noun

1. pure ethyl alcohol (containing no more than 1% water)