在化学中，沉淀是通过使两种盐反应或通过改变温度以影响化合物的溶解度来形成不溶性化合物。此外，由沉淀反应形成的固体的名称。沉淀可能表明发生了化学反应，但如果溶质浓度超过其溶解度，也可能发生。沉淀之前是称为成核的事件，其是当小的不溶性颗粒彼此聚集或者与表面形成界面时，例如容器的壁或晶种。这个术语看起来有点令人困惑。以下是它的工作原理：从溶液中形成固体称为沉淀。在液体溶液中形成固体的化学物质称为沉淀剂。固体称为沉淀物。如果不溶性化合物的颗粒尺寸非常小或重力不足以将固体吸引到容器的底部，则沉淀物可以均匀地分布在整个液体中，形成悬浮液。沉淀是指将沉淀物与溶液的液体部分分离的任何程序，称为上清液。常见的沉降技术是离心。一旦回收沉淀物，所得粉末可称为“花”。
澳洲阳光海岸大学化学Essay代写：沉淀在化学中的定义和实例
In chemistry, to precipitate is to form an insoluble compound either by reacting two salts or by changing the temperature to affect the solubility of the compound. Also, the name given to the solid that is formed as a result of a precipitation reaction. Precipitation may indicate a chemical reaction has occurred, but it may also occur if solute concentration exceeds its solubility. Precipitation is preceded by an event called nucleation, which is when small insoluble particles aggregate with each other or else form an interface with a surface, such as the wall of a container or a seed crystal. The terminology can seem a bit confusing. Here’s how it works: Forming a solid from a solution is called precipitation. A chemical that causes a solid to form in a liquid solution is called a precipitant. The solid is called the precipitate. If the particle size of the insoluble compound is very small or there is insufficient gravity to draw the solid to the bottom of the container, the precipitate may be evenly distributed throughout the liquid, forming a suspension. Sedimentation refers to any procedure that separates the precipitate from the liquid portion of the solution, which is called the supernate. A common sedimentation technique is centrifugation. Once the precipitate has been recovered, the resulting powder may be called a “flower”.