Sorting Materials into Groups

Properties of Materials:

The following are the properties of materials:
Appearance: 

• Woods is different from iron and vice versa.
• Lustre: Lustre material is usually metal. For example, Iron, Copper, gold, etc

Hardness:

As strength wise, there are two types of materials:

• Soft Materials: 
• Materials that can be scratched or compressed easily are called soft materials. Examples, cotton, wool, etc
• Hard Materials: 
• Materials that can not be scratched or compressed easily are called hard materials. Examples, Iron, Alumunium, etc

Soluble or insoluble?

• Some substances have completely disappeared in the water, called soluble in water. For example, salt, sugar, etc.
• Some substances are not soluble in water, called insoluble in water. For example, stone, iron, etc.

Transparency:
Based on the visibility or light reflection the following are the three types of materials:

• Transparent: Through able to see the object clearly without any confusion. The Materials that allow all light to pass through them are called Transparent materials. For example, glass, water, air, etc.
• Translucent: Through able to see the object but not clearly visible. The Materials that allow some light to pass through them are called Translucent materials. For example, oily patch paper.
• Opaque:  Through not able to see the object. The Materials that not allow passing the light through them are called opaque materials. For example, Iron, Alumunium, 

Why do we need to group materials?

We often group materials for our convenience. We arrange a similar object together, it helps us to locate them easily. Dividing materials into groups make it easy to study their properties.

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