buffer noun [ C ] uk / ˈbʌfə r/ us someone or something that provides protection against difficult situations, problems, angry people, etc.: serve as/act as/be a buffer Savings can be a buffer during times of financial hardship. a buffer against sth A special committee was formed to serve as a buffer against customer complaints.

2022/9/28 · buffer, in chemistry, solution usually containing an acid and a base, or a salt, that tends to maintain a constant hydrogen ion concentration. Ions are atoms or molecules that have lost or gained one or more electrons. An example of a common buffer is a solution of acetic acid (CH 3 COOH) and sodium acetate.

2020/8/15 · A buffer is a solution that can resist pH change upon the addition of an acidic or basic components. It is able to neutralize small amounts of added acid or base, thus maintaining the pH of the solution relatively stable. This is important for processes and/or reactions which require specific and stable pH ranges.

What is Buffer in Chemistry? A solution whose pH is not altered to any great extent by the addition of small quantities of either an acid or base is called buffer solution. Buffer is also defined as the solution of reserve acidity or alkalinity which resists change of pH upon the addition of a small amount of acid or alkali.

2020/8/15 · A buffer is a solution that can resist pH change upon the addition of an acidic or basic components. It is able to neutralize small amounts of added acid or base, thus maintaining the pH of the solution relatively stable. This is important for processes and/or reactions which require specific and stable pH ranges.

C语言中，可以用 #define 定义一个标识符来表示一个常量。 其特点是： 定义的标识符不占内存，只是一个临时的符号，预编译后这个符号就不存在了 。 预编译 又叫 预处理 。 预编译不是编译，而是编译前的处理，编译器正式开始编译程序之前，会执行一段预处理程序（又称预处理器）专门对程序执行预处理操作。 C语言程序从编写到运行要经过预处理、编译、汇编和链接这 4 个 …

A buffer is an aqueous solution that consists of a mixture of a weak acid and its salt (acid buffer) or a weak base with its salt (basic buffer). Its pH changes very little when a small amount of strong acid or base is added to it and is thus used to prevent a solution's pH change.

Buffer Solution Buffer Solution is a water solvent based solution which consists of a mixture containing a weak acid and the conjugate base of the weak acid, or a weak base and the conjugate acid of the weak base. They resist a change in pH upon dilution or upon the addition of small amounts of acid/alkali to them.

2006/7/10 · 1、 define ——（无参数宏定义） 用法 一般形式为：# define 标识符 字符串 （1）“#”表示其为预处理命令，凡是以“#”开头的都是预处理命令；“ define ”为宏定义命令；“标识符”为所定义的宏名；“字符串”可以是常数、表达式、字符串等。 （2）除了经常用到的如“# define MAXNUM 100”之外，还有其它多种灵活的 用法 ，如“ C/ C++ define用法 weixin_30338461的 …

被定义为“宏”的标识符称为“宏名”。 在编译预处理时，对程序中所有出现的“宏名”，都用宏定义中的字符串去代换，这称为“宏代换”或“宏展开”。 宏定义是由源程序中的宏定义命令完成的。 宏代换是由预处理程序自动完成的。 在C或C++语言中，“宏”分为有参数和无参数两种。 2. 无参宏定义 无参宏的宏名后不带参数。 其定义的一般形式为： #define 标识符 字符串 其中的“#”表示这是一条 …