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-3
Questions No-3
A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
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The ability of a diver to cut through water in a swimming pool shows that matter is made up of particles.
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A diver is able to cut through water in a swimming pool. This shows that the particles of water have intermolecular space and has less force of attraction.
The ability of a diver to cut through water in a swimming pool shows that the particles of matter have intermolecular spaces. The intermolecular spaces in liquids is fair enough to let the diver pass through it.
The phenomena of a diver cutting through water in a swimming pool shows that matter possesses the property of fluidity or fluid behavior.
Substances with the property of fluidity are able to change shapes and flow while remaining together without falling apart. Fluids refer to liquids and gases that have no definite shape and they flow whenever they are subjected to an external force.
Fluidity exists in water that is a liquid. In swimming pool, the water molecules are able to get out of the way easily and move around the diver’s body as it passes through thus, no much resistance is experienced by the diver and it swims freely cutting through the water. This allows the diver to move through water quite free, experiencing less resistance than one would when moving through a wall, which is not a fluid-behaving object.