A solution of known molarity is called a standard solution. Its concentration is determined by a process known as standardization. solution of known molarity is called a standard solution. Its concentration is determined by a process known as standardization.
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constriction beams is a generic term, joists are the studs in the ceiling (walls=studs/ceiling-joists) and, I assume, you mean headers. headers are the supports over openings-doors,windows,archways, etc.