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.
I assume the question is: What is physical address space and logical address space?. So, my answer is based on the above assumption. Let say your system has 2 GB of physical memory (RAM) divided into words of size 8 bytes(on a 64 bit machine). So every word is assigned an address. This actual address is called physical address. At this stage let me tell you we are blind to those physical addresses.