这关键区别在密度和集中之间物质的密度仅取决于事情within a given体积而浓度也取决于物质的量和哪种化合物。
密度和浓度是我们在化学和物质科学下讨论的两个基本和重要主题。因此,在讨论密度和集中度之间的差异之前,必须对此类概念有透彻的理解。
CONTENTS
1。概述和关键差异
2。什么是密度
3。什么是集中度
4。Side by Side Comparison – Density vs Concentration in Tabular Form
5。Summary
什么是密度?
密度是物质的重要特征。它直接与质量连接。因此,清楚地了解质量至关重要。因此,质量是对惯性一个对象。密度,最原始的形式,是单位体积的质量。
For a bulk material with uniform mass distribution, we can easily calculate this parameter by dividing the total mass of the object by the total volume occupied. However, if the mass distribution is not even, we need more complicated methods to measure the density.
Furthermore, we can easily describe the floatation of a substance using its density. Here, the floatation means that a fluid or a uniform solid that is denser than a given fluid will drown in the given fluid. Thus, if the density of the fluid or the uniform solid is lesser than that of the given fluid, it will float on the given fluid. Moreover, we can define the term相对密度为了比较两种流体的密度。这是两个密度的比率,仅是一个数字。
什么是集中度?
集中度是化学中的另一个重要概念。从定性的意义上讲,浓度是溶液中化合物的量。我们可以定义几种类型的浓度。例如,质量浓度是单位体积中给定化合物的质量。通常,此参数的单位为g / dm3,但是还有其他一些单位。
此外,摩尔浓度是痣单位体积中给定的化合物的。该定义的单位是mol / dm3。同样,数量浓度是单位体积中给定化合物的分子数。它的单位是DM-3(per cubic decimeter). The volume concentration is the volume fraction of the considered compound from the total volume of all compounds before mixing.
所有这些浓度术语彼此互连。因此,我们可以通过将质量浓度除以给定化合物的相对分子量来获得摩尔浓度。
Similarly, we can obtain the number concentration by multiplying the molar concentration by the Avogadro number. And the derivation of the pressure concentration requires the ideal gas equation. On the other hand, we can express the concentration also in ppm, which means parts per million. It is a very useful form when expressing small concentrations. Also, the concentration of a non-dissolvable solid is a constant and does not depend on the volume.
What is the Difference Between Density and Concentration?
密度是物质质量和体积之间的比率,而浓度是物质的量和体积之间的比率。因此,密度和浓度之间的关键差异在于物质的密度仅取决于给定体积内的物质量,而浓度也取决于物质的量以及其中什么化合物。
随着密度的另一个重要区别d concentration we can say that the density can be given for all three phases of matter while the concentration is given for a solution in liquid phase. A further difference between density and concentration is that the density can be homogeneous or heterogeneous depending on the material. But, concentration is always a homogeneous property.
摘要 - 密度与浓度
密度和浓度是物质的重要物理参数。密度和浓度之间的关键差异在于,物质的密度仅取决于给定体积内的物质量,而浓度也取决于物质的量以及其中什么化合物。
参考:
1.琼斯,安德鲁·齐默尔曼。“密度介绍:定义和计算。”ThinkCo,2018年10月25日。在这里可用
2. Helmenstine,Anne Marie博士“浓度定义(化学)。”ThinkCo,2018年6月22日。在这里可用
图片提供:
1. Prhaney的“密度柱” - 自己的工作,(CC BY-SA 3.0)通过下议院维基梅迪亚
2. FirstPrinciples(公共领域)通过下议院维基梅迪亚
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