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  2. Desiccator - Wikipedia

    en.wikipedia.org/wiki/Desiccator

    The ground-glass rim of the desiccator lid must be greased with a thin layer of vacuum grease, petroleum jelly or other lubricant to ensure an airtight seal. In order to prevent damage to a desiccator the lid should be carefully slid on and off instead of being directly placed onto the base.

  3. Test tube rack - Wikipedia

    en.wikipedia.org/wiki/Test_tube_rack

    Test Tube Rack. Test tube racks are laboratory equipment used to hold upright multiple test tubes at the same time. They are most commonly used when various different solutions are needed to work with simultaneously, for safety reasons, for safe storage of test tubes, and to ease the transport of multiple tubes.

  4. Hermetic seal - Wikipedia

    en.wikipedia.org/wiki/Hermetic_seal

    A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases). The term originally applied to airtight glass containers, but as technology advanced it applied to a larger category of materials, including rubber and plastics. Hermetic seals are essential to the correct and safe ...

  5. Bellows - Wikipedia

    en.wikipedia.org/wiki/Bellows

    Diagram of a fireplace hand-bellows. A bellows or pair of bellows is a device constructed to furnish a strong blast of air.The simplest type consists of a flexible bag comprising a pair of rigid boards with handles joined by flexible leather sides enclosing an approximately airtight cavity which can be expanded and contracted by operating the handles, and fitted with a valve allowing air to ...

  6. Burette clamp - Wikipedia

    en.wikipedia.org/wiki/Burette_clamp

    Burette clamp is a scientific equipment which used specifically to hold and secure a burette on a stand, so that a burette is fixed and more convenient for the experiment. [1] Burette clamps can be made with many materials such as plastic and cast iron. However, an iron clamp with a rubber knob to hold the burette are usually more durable.

  7. Is there already a College Football Playoff controversy ...

    www.aol.com/sports/college-football-playoff...

    The debate over the CFP’s final first-round bye is an extension of a long-running tussle between the power leagues and those from the lower-resourced level of the Football Bowl Subdivision.