Classification can be classified into four cases include: 1. use a status criterion. Divided into three groups: -Solid state (Solid) will have a fixed shape and volume, in which the particles within the contiguous, such as alkaline, Ruby (KMnO4), copper (Cu). -Status of liquid (Liquid) are shaped according to the container and the volume in which the particles are close together are less than solid and fluid such as oil, as alcohol, mercury (Hg), etc. -A State that is a gas (Gas) is a shape and volume that are not fixed by the shape changes according to the particle within the container will stay away, and there is a treasure of the flow, such as cooking gas, air. 2. use a mixture of criteria will have the physical properties of substances observed characteristics, the difference of the mixture which are classified into two groups. -The same substance (Homogeneous Substance) Substances that contain a substance identical to substances having identical treasures throughout all sectors such as alcohol, gold (Au), solder. -Mixed meat (Heterogeneous Substance) Substances that contain different substances in each section to make the substance, not the same at all, such as steam, water, Canal, etc., Thailand. 3. melt water as the criteria to be classified into three groups: -Substances such as dissolved salts (NaCl) Curry, Ruby (KMnO4) etc., alkali. -Substances, which are water soluble, such as chlorine gas (Cl2), carbon dioxide (CO2), etc. -The substance is not soluble, such as sulfur (S8), iron (Fe), etc. 4. electrical conductivity as a basis it will recognize two groups include: -Electrically conductive compounds such as copper (Cu), water gate lue etc. -Non-conductive substances, such as limestone (CaCO3), oxygen (O2).
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