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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|
|Name of the material|
|Floats/ Sinks in water||Soluble/ Insoluble in water|
|Lump of salt||Hard||Opaque||Sinks||Soluble|
|Therm- ocol box||Soft||Opaque||Floats||Insoluble|
|A piece of sugar candy||Hard||Opaque||Sinks|
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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