Expected Levels. Total hardness in freshwater is usually in the range of 15 to 375 mg/L as CaCO3. Calcium. hardness in freshwater is in the range of 10 to 250 mg/L, often double that of magnesium. hardness (5 to 125 mg/L). Typical seawater has calcium hardness of 1000 mg/L, magnesium.
Part of the Storage management glossary: A physical address is a binarynumber in the form of logical high and low states on an address busthat corresponds to a particular cell of primary storage(also called main memory), or to a particular register in a memory-mapped I/O(input/output) device.
In execution time binding, the MMU makes a mapping from logical address to physical address because in this type of binding: The address actually has no meaning because it is there to illusion the user that it has a large memory for its processes. The address actually bear meaning when mapping occurs and they get some real addresses which are present in physical memory.