Bar (unit) mb (rather than the proper mbar) to denote the millibar. Between 1793 and 1795, the word bar was used for a unit of weight in an early version of the metric system. Atmospheric air pressure is often given in millibars, where standard atmospheric pressure at sea level is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about . Despite the millibar not being an SI unit, meteorologists and weather reporters worldwide have long measured air pressure in millibars as the values are convenient. After the advent of SI units, some meteorologists began using hectopascals (symbol hPa) which are
Single Compilation Unit For example, if you have the source files foo.cpp and bar.cpp, they can be placed in a Single Compilation Unit as follows: Suppose foo.cpp and bar.cpp are: //foo.cpp int main() // Definition of function 'main' //bar.cpp void bar() // Definition of function 'bar' Now the standard header file (iostream) is compiled only once, and function bar may be inlined into function main, despite being from another module. Single Compilation Unit Single Compilation Unit (SCU) is a computer programming technique for the C and C++ languages, which reduces serial compilation time and allows the compiler to perform certain program optimizations even