shell ventilation
11Radon — This article is about the chemical element. For other uses, see Radon (disambiguation). astatine ← radon → francium Xe ↑ Rn ↓ Uuo …
12Underground mining (hard rock) — A three dimensional model of an underground mine with shaft access Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals[1] such as ore containing gold …
13mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… …
14Bicycle helmet — A bicycle helmet is a helmet intended to be worn while riding a bicycle. They are designed to attenuate impacts to the skull of a cyclist in falls while minimizing side effects such as interference with peripheral vision.[1] There is an active… …
15architecture — /ahr ki tek cheuhr/, n. 1. the profession of designing buildings, open areas, communities, and other artificial constructions and environments, usually with some regard to aesthetic effect. Architecture often includes design or selection of… …
16Equestrian helmet — An Equestrian helmet is worn when riding horses. This type of helmet is specially designed to protect the rider s head if a person falls off a horse, especially if they should strike their head on a hard object while falling or accidentally be… …
17Architecture and Civil Engineering — ▪ 2009 Introduction Architecture For Notable Civil Engineering Projects in work or completed in 2008, see Table (Notable Civil Engineering Projects (in work or completed, 2008)). Beijing was the centre of the world of architecture… …
18Medical ventilator — For other uses, see Modes of mechanical ventilation. For other uses, see ventilation (physiology). The Bird VIP Infant ventilator A medical ventilator can be defined as any machine designed to mechanically move breatheable air into and out of the …
19Carbon dioxide — Carbon dioxide …
20Chicken — Gallus gallus domesticus redirects here. For other subspecies, see Red Junglefowl. Chooks redirects here. For the fast food chain, see Chooks Fresh Tasty. This article is about the animal. For chicken as human food, see Chicken (food). For other… …
