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Flask may refer to:

  • Laboratory flask, laboratory glassware for holding larger volumes than simple test tubes
    • Erlenmeyer flask, a widely used type of laboratory flask which features a flat bottom, a conical body, and a cylindrical neck
  • Vacuum flask a container designed to keep warm drinks warm and refrigerated drinks cold
  • Hip flask, a small container used to carry a small amount of liquid
  • Flask (casting) a container without a top or bottom, with sides only, used to hold molding sand
  • Flask (web framework) a web framework for the Python programming language
  • Powder flask
  • FLASK, the Flux Advanced Security Kernel, an operating system security architecture
  • Flask, a 76-pound (34.46 kg) unit of mass used to measure mercury. Mercury does not react with iron. Historically, mercury was stored and shipped in iron flasks.

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