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21building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
22Column chromatography — A chemist in the 1950s using column chromatography. The Erlenmeyer receptacles are on the floor. Column chromatography in chemistry is a method used to purify individual chemical compounds from mixtures of compounds. It is often used for… …
23floor covering — Finish material on floors, including wood strips, parquet, linoleum, vinyl, asphalt tile, rubber, cork, epoxy resins, ceramic tile, and carpeting. Wood strip flooring, attached to a subfloor of plywood, is most popular, especially for residences …
24separation and purification — ▪ chemistry Introduction in chemistry, separation of a substance into its components and the removal of impurities. There are a large number of important applications in fields such as medicine and manufacturing. General principles… …
25Rock-climbing equipment — Rock climbing History Styles Technique Equipment and protection Grades (difficulty of climb) Terminology Belaying Abseiling …
26List of model car brands — This list is incomplete; you can help by expanding it. See also: Category:Toy cars and trucks This page lists model car brand names past and present. Contents: Top · 0–9 A B C D E F G H I J K L M N O P …
27Particle board — For the alternative to plywood, see Oriented Strand Board. Particleboard with veneer µCT flight through a piece of particle board. View lateral, resol …
28Vehicles of the Imperium (Warhammer 40,000) — The following text describes vehicles used by the Imperium in the fictional Warhammer 40,000 universe. It includes mostly vehicles from the Warhammer 40,000 and Epic line of tabletop games. The Imperium of Man is composed of several armed… …
29Philodendron — Taxobox name = Philodendrons image width = 250px image caption = Tree Philodendron ( Philodendron bipinnatifidum ) regnum = Plantae divisio = Magnoliophyta classis = Liliopsida ordo = Alismatales familia = Araceae subfamilia = Aroideae tribus =… …
30Reciprocating screw machinery — is used for the extrusion blow molding of hollow containers. Examples of parts manufactured from these machines include lightweight HDPE bottles for dairy and water, as well as large 3 5 gallon polycarbonate bottles for water coolers. Description …
