A cylinder is a surface with a circular base, a circular top of the same size, and the curved surface formed by the vertical line segments joining them. For a cylinder with base of radius r and height h, the cylinder’s interior has volume πr2h, and the area of the curved surface equals 2πrh.
A right circular cylinder
More generally, a cylinder is a surface, consisting of the points of the lines, called generators, drawn through the points of a fixed curve and parallel to a fixed line. The generators may be extended indefinitely in both directions. Compare prism.
A cylinder over a curve
A geometric shape that has a uniform circular cross section and length. The length is greater or equal to the diameter. Examples of cylindrical vessels include drums and tanks, and may be either vertically or horizontally positioned along their axis. Columns are also cylindrical and mounted vertically, whereas gravity separators such as those used to separate oil, gas, and water on offshore platforms, are mounted horizontally.
- shell-type transformer
- shelly limestone
- Shell’s method
- sheltered monopoly
- shelter porosity
- Shenzhen Stock Exchange
- Shenzhou
- Shepard, Alan Bartlett (1923–98)
- Shepard, Alan Bartlett, Jr. (1923–98)
- Shepard diagram
- Shepherd, Mary (1777–1847)
- shepherd moon
- Shepherd, William McMichael (1949– )
- Sheppard, William Fleetwood (1863–1936)
- Sheppard’s corrections
- sherardizing
- Shere Ali (1825–79)
- shergottite
- shergottite/nakhlite/chassignite meteorites
- Sheridan, Philip Henry (1831–88)
- sheriff
- Sheriffmuir, Battle of (13 November 1715)
- Sherman Act
- Shermanian
- Sherman, William Tecumseh (1820–91)