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2. Pool noodle - Wikipedia

   en.wikipedia.org/wiki/Pool_noodle

   A pool noodle is a cylindrical piece of flexible, buoyant polyethylene foam. Pool noodles are used by people of all ages while swimming. Pool noodles are useful when learning to swim, for floating, for rescue reaching, in various forms of water play, and for aquatic exercise. The most common dimensions are about 160 centimetres (5 ft 3 in) in ...

3. Tube (fluid conveyance) - Wikipedia

   en.wikipedia.org/wiki/Tube_(fluid_conveyance)

   A tube and pipe may be specified by standard pipe size designations, e.g., nominal pipe size, or by nominal outside or inside diameter and/or wall thickness. The actual dimensions of pipe are usually not the nominal dimensions: A 1-inch pipe will not actually measure 1 inch in either outside or inside diameter, whereas many types of tubing are ...

4. Fire hose - Wikipedia

   en.wikipedia.org/wiki/Fire_hose

   These hoses are expected to find applications in large-scale industrial firefighting, as well as in disaster relief efforts and military operations. [17] Fire hoses come in a variety of diameters. Lightweight, single-jacket construction, 3 ⁄ 4, 1, and 1 + 1 ⁄ 2 inch diameter hose lines are commonly used in wildfire suppression applications

5. Pipe (fluid conveyance) - Wikipedia

   en.wikipedia.org/wiki/Pipe_(fluid_conveyance)

   In common usage the words pipe and tube are usually interchangeable, but in industry and engineering, the terms are uniquely defined. Depending on the applicable standard to which it is manufactured, pipe is generally specified by a nominal diameter with a constant outside diameter (OD) and a schedule that defines the thickness.

6. Venturi effect - Wikipedia

   en.wikipedia.org/wiki/Venturi_effect

   The simplest apparatus is a tubular setup known as a Venturi tube or simply a Venturi (plural: "Venturis" or occasionally "Venturies"). Fluid flows through a length of pipe of varying diameter. To avoid undue aerodynamic drag, a Venturi tube typically has an entry cone of 30 degrees and an exit cone of 5 degrees. [1]

7. Sphere packing in a cylinder - Wikipedia

   en.wikipedia.org/wiki/Sphere_packing_in_a_cylinder

   Some dry foam structures with interior cells were found to consist of a chain of pentagonal dodecahedra or Kelvin cells in the centre of the tube. [11] For many more arrangements of this type, it was observed that the outside bubble layer is ordered, with each internal layer resembling a different, simpler columnar structure by using X-ray ...