Phase Inspection. 1  Framing: proper technique, boring & notching, wood grade, defective or missing members. 2  Window and door installation and water proofing. 3  Exterior sheathing and vapor barrier is correctly installed. â 4 Plumbing and Electrical inside the walls with correct nail stop shield placement.
Hydrogen is the lightest of the elements and is the most abundant element in the universe. (Also reference http://www.ducksters.com/science/chemistry/hydrogen.php) earth's atmosphere
Fortunately, HowStuffWorks explains that nitrogen is plentiful on Earth. When not bound to other elements, nitrogen forms a colorless, tasteless, odorless gas. Nitrogen is the most abundant element in the atmosphere, representing nearly 78 percent of the atmospheric volume and 75 percent of the atmospheric weight.