During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table 4.1 below. Help them in filling the table.

Name of the material	Appearance(Hard/Soft)	Transparency(Transparent/Translucent/Opaque)	Floats/ Sinks in water	Soluble/ Insoluble in water

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Transparency: Transparency (or transmission of visible light) is characterized by light transmittance, i.e. the measured percentage of incident light transmitted through a standardized plastic specimen. The higher the transmittance %, the higher the transparency. There are three types of transparency:

Transparent Objects: If you are able to see clearly through an object, it is allowing light to pass through it and is transparent. For example water, clear glass, etc.

Opaque Objects: If we cannot see through an object at all, it is an opaque object. For example a wooden door, wall, etc.

Translucent Objects: There are some objects through which we can see, but not very clearly. Such objects are known as translucent. For example Butter paper, ground glass, etc

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Updated on: 01-Feb-2023

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