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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There are two types of housings, New Construction and Remodel. Determining which type to use will depend on your application. If the ceiling has not been installed or if a T-bar ceiling is used, you will want to use a New Construction housing. If you do not have access, you will want to use a Remodel housing.