NCERT Solution for Class 9 Science Chapter 1
Matter in Our Surroundings
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-6
Questions No:3 Part: c
Give reasons: A wooden table should be called a solid.
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A wooden table has a definite shape and volume. It is very rigid and cannot be compressed i.e., it has the characteristics of a solid. Hence, a wooden table should be called a solid.
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A wooden table is classified as a solid due to several inherent characteristics associated with solids:
1. Definite shape and volume: For example, a wooden table retains its size and shape. It does not assume a shape of its container, neither does it behave like a fluid. Solids are clearly delineated with edges but can only be changed when acted upon by external force.
2.Particle arrangement: Solids have tightly packed particles with a regular arrangement including the wood that formed the table. The table contains compactly-arranged molecules in the state of the wood leading to its firmness and high resistance.
3. Rigidity: Rigidity is a high level of resistance to deformation which solids possess. The fact that a wooden table is firm means that it usually does not change its shape easily except an amount of weight is added to it.
4. Low compressibility: Compared to liquids and gases, solids are less compressible. In a case of a solid, the particles are already tightly packed and thus cannot readily be subjected to additional compression. The strength and compressive nature of a wooden table are some of its distinctive characteristics.
5.High density: Solids usually exhibit higher density than liquids and gases. Because wood is solid, it has more tightly arranged molecules leading to high density.
Taken together, these characteristics constitute a solid. A wooden table serves as an illustration of one such solid in the classification of states of a matter.