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What is the meaning of Material?
Material is any substance or mixture of substances that occupy space, has a volume and has a mass. We need to group materials for our convenience and to study their properties. These properties are:
• Appearance
• Solubility
• Hardness
• Float/sink
• Transparent/opaque
Below are some properties of materials
• Appearance: The look, feel, texture in addition to lustre, colour and quality defines the property of appearance of the material.
• Soluble/Insoluble: The nature of the material to completely dissolve in water is termed as soluble material.
Eg: Lemon juice, Sugar and Salt.
• Materials that don’t completely dissolve in water, they form a thin film over the surface.
Eg: Oil, Kerosene and Sawdust.
• Hardness: materials that can be compressed easily are called soft. while the materials that cant be compressed easily are called hard.
Eg: the key is hard, cotton is soft.
• Float/Sink: the weight of the material helps to define this property. If the material is lightweight, it will float over the surface, therefore, are called floating material.
Eg: Sawdust, Oil, Plastic and Wood.
The material is heavyweight and it will sink in water.
Eg: Stone and Metals
• Transparency/Opaque: The amount of light material allowed passing through a material is the transparency of the material. The maximum amount of light to pass through the material, therefore, they are transparent materials.
Eg: Plastic, Air, and Glass.
• Translucent materials are, which only allow light to pass through them partially.
Eg: Oiled paper, Coloured syrup, and some sheer materials.
• An opaque object is the materials, which don’t allow any light to pass through them.
Eg: Wood, Cardboard, and Metals.
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