A typical diffusion constant for a medium-sized molecule in water is about . If we want the smell to travel a quarter mile, or a little less than , we get a speed of. This speed is fantastically slow, and says that it would take ten million years for blood to diffuse out to a shark a quarter mile away.
XML Parser. A parser is a piece of program that takes a physical representation of some data and converts it into an in-memory form for the program as a whole to use. Parsers are used everywhere in software. An XML Parser is a parser that is designed to read XML and create a way for programs to use XML. There are different types, and each has its advantages. Unless a program simply and blindly copies the whole XML file as a unit, every program must implement or call on an XML parser.
Parsing means to...well...I it's one of those things that's kind of hard to explain, I'll give a few examples. When you go to a website, the html code, which means nothing to most people, and is not how the site is supposed to look, is parsed by the browser into what you see. to breaks, et cetera. Another time when parsing is used is with xml files. The tags within an xml file mean nothing without a set of rules. With code that parses an xml file, it defines those rules, and could specify that <cheese> is supposed to be parsed into <strong>, which is then parsed by the browser into a webpage you can read.