Hangar One is one of the world's largest freestanding structures, covering 8 acres (3.2 ha) at the Moffett Field airship hangars site at Moffett Field in Mountain View, in Santa Clara County of the southern San Francisco Bay Area, California.
Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a solute in a solution, or of any chemical species, in terms of amount of substance per unit volume.
1 Molarity (M.) The number of moles of a solute divided by the volume of the solution. A mole is a unit often used in chemistry to describe the number of atoms or molecules of a substance.  Parts per million (ppm.) The number of units (usually grams or milligrams) of a solute found in one million units of the solution.