The general concepts found in this section are: 1  The earth's atmosphere is a very thin layer wrapped around a very large planet. 2  Two gases make up the bulk of the earth's atmosphere: nitrogen (), which comprises 78% of the atmosphere, and oxygen (), which accounts for 21%.
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Model of the lean production system. Lean manufacturing or lean production, often simply lean, is a systematic method for waste minimization (Muda) within a manufacturing system without sacrificing productivity. Lean also takes into account waste created through overburden (Muri) and waste created through unevenness in work loads (Mura).