French chemist and physicist who isolated the element boron(1809) and formulated a law that explains the behavior of a gas under constant pressure. 盖鲁萨克，约瑟夫·路易斯1778－1850法国化学家和物理学家，析出硼元素(1809年), 并且确切陈述了解释气体在固定压力下的表现方式的定律
A variable that is given a constant value for a specified application and that may denote the application. 一种为专用应用程序而给定一个常数值的变量，而且它可以表示该应用程序。
A constant, variable, function name, or expression. 一种常数、变量、函数名或表达式。
A letter or symbol that represents a particular constant or number, known or unknown, and is not programmer-defined. 文字代表一特定常量或数字的可知或未知的字母或符号，非编程者所规定
