Definition

1. Noun:
   • A spherical flask with a narrow neck: A round-bottom flask is a type of laboratory glassware characterized by a spherical body and a long, cylindrical neck. It is designed for uniform heating and stirring of liquids, often used in distillation, reflux, and other chemical reactions.

Usage Examples

• Noun:
  • The chemist placed the solution in a round-bottom flask for the distillation process.
  • A round-bottom flask must be clamped securely when heated over a Bunsen burner.

Advanced Usage

• "In a round-bottom flask": Describes a substance or reaction contained within this specific piece of equipment.
  • The reaction mixture was refluxed in a 500 mL round-bottom flask for two hours.

Variants and Related Words

• Flask (n): A general term for a container with a narrow neck, used in laboratories.
  • She used a volumetric flask to prepare the standard solution.
• Boiling flask: Another term sometimes used interchangeably with round-bottom flask.
• Flat-bottom flask (n): A flask with a flat base, allowing it to stand upright on a surface without support, in contrast to a round-bottom flask.

Synonyms

• Boiling flask: A flask, typically round-bottomed, designed for boiling liquids.
• Spherical flask: A descriptive synonym emphasizing the shape.

Related Phrases

• Clamp a round-bottom flask: The necessary action to secure it, as it cannot stand on its own.
  • Always clamp a round-bottom flask at the neck before applying heat.
• Round-bottomed flask: An alternative adjectival form with the same meaning.

Noun

1. a spherical flask with a narrow neck