$(a)$ Compare a block of wood,water,and air on the basis of the following:
$(i)$ Compressibility
$(ii)$ Particle motion
$(iii)$ Rigidity
$(b)$ Account for the following:
$(i)$ Gases exert pressure on the walls of the container.
$(ii)$ Liquids can be called fluids.
$(i)$ Compressibility
$(ii)$ Particle motion
$(iii)$ Rigidity
$(b)$ Account for the following:
$(i)$ Gases exert pressure on the walls of the container.
$(ii)$ Liquids can be called fluids.
(N/A) The comparison is as follows:
$(b)$ $(i)$ Gases exert pressure on the walls of the container because gas particles are in constant random motion at high speeds. When they collide with the walls of the container,they exert a force per unit area,which is perceived as pressure.
$(ii)$ Liquids are called fluids because they have the ability to flow and change their shape according to the container they are placed in,which is a characteristic property of fluids.
| Property | Block of wood | Water | Air |
|---|---|---|---|
| $(i)$ Compressibility | Negligible | Very low | High |
| $(ii)$ Particle motion | Least (vibratory only) | More than wood | Very high (random) |
| $(iii)$ Rigidity | Rigid | Fluid | Fluid |
$(b)$ $(i)$ Gases exert pressure on the walls of the container because gas particles are in constant random motion at high speeds. When they collide with the walls of the container,they exert a force per unit area,which is perceived as pressure.
$(ii)$ Liquids are called fluids because they have the ability to flow and change their shape according to the container they are placed in,which is a characteristic property of fluids.
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