A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
pH的含义是氢离子浓度的负对数，用来衡量溶液的酸碱度。即pH= lg (cH )。 1.根据对数函数图像可知：
pH值是化学溶剂的酸碱度值，是用来表示溶液的酸碱度，以判断溶液时酸性、中型还是碱性。用试纸测试，数值越趋向于0酸性越强，越趋向于14碱性越强，7为中性。在标准温度（25℃）和压力下，纯水的pH值为7。 通俗的讲，pH值是化学反应强度的一种指示，碱性溶剂pH值越高，化学反应的强度越大 ...
谢邀。 pH的本质是氢离子浓度的另一种表示方法，即在常见的溶液中采用对数表示氢离子的浓度（因为这类溶液中氢离子的浓度往往较低），以降低复杂度（可以对比一下pH=7与 c (H ) = 10 7 mol L）。 可通过 电离常数 计算液体混合后的pH。
因此pH的检测结果不能精确地定义人体内所有的酸。 摘录《酸碱失衡及治疗》（第2页），【第一章，酸碱化学和缓冲】， [Sørensen（索伦森）用一种能产生电压的电极测定pH， 但事实上用电极技术对AH（酸）做出精确的定义是不可能的。 ] （2）pH 7.35~7.45范围太大。
ph 和 PH 的区别是什么？ 度娘资料： pH值，亦称氢离子浓度指数、酸碱值，是溶液中氢离子活度的一种标度，也就是通常意义上溶液酸碱 程度的衡量标准。 这个概念是1909年由丹麦 … 显示全部 关注者 10 被浏览
14以上在水溶液里也超不了很多，理由同上。 但 非水体系 可以有高于14很多的pH值，印象中各种烷的pH值能到25～30左右，而且远远不是最高。 然后关于非水体系的pH能负多少我是真忘了，但受密度和分子量的影响应该也不会负很多。
水的pH值对于水质和人体健康都至关重要。合适的pH值范围可以确保水质的稳定性和安全性，同时也有益于人体健康。一般来说，不同种类的水其pH值范围有所不同，但总体来说，正常饮用水的pH值应该在一个相对稳定的范围内。 正常饮用水的pH值范围 根据我国饮用水国家标准，饮用水的pH值应在6.5~8.5 ...
从表格可以看出， 温度变化的时候，理论斜率有非常明显的差异。 pH温度补偿 通常我们所说的 pH温度补偿，是将电极的斜率，补偿到当前样品测试温度下的斜率，从而在同时测得温度的情况下，pH计能够精确地测量，并自动计算得到当前测试温度下的pH值。 现在很多pH计都有自动温度补偿功能，提高 ...
总结一下，提问关于为什么 pH=0 的情况为什么不是最强酸的原因一共有两个层次的解答， 第一，pH 直接指涉未经特别宣明不控制背景变量的氢离子浓度，与酸性强度不直接相关； 第二，pH=0 并非 pH 取值范围的边界。 酸度系数是用来描述物质的酸性强度的更好 ...
完全可以。 常温下，ph值的计算公式为：p（H）= lg c (H ），常温下，水溶液中，氢离子与氢氧根离子的溶度积为pw=10的负14次方，如果二者相等，那么c (H )=c (OH )=10负7次方，此时计算出来的p (H)值就是7，也就是说 中性溶液 的p（H）值为7。
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