(a) Compare the properties of solids, liquids and gases in tabular form.

(b) Give two reasons for saying that wood is a solid.

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Solution

(a) Comparison of Solid, Liquid and Gas.

Meaning Solid refers to a form of matter which has structural rigidity and has a firm shape which cannot be changed easily Liquid is a substance, that flows freely, having a definite volume but no permanent shape Gas refers to a state of matter, do not have any shape but conform to the shape of the container, completely, in which it is put in

Shape and Volume Fixed shape and volume. No fixed shape but has volume. Neither definite shape nor volume.

Energy Lowest Medium Highest

Compressibility Difficult Nearly difficult Easy

Arrangement of molecules Regular and closely arranged. Random and little sparsely arranged. Random and more sparsely arranged.

Fluidity Cannot flow Flows from higher to lower level. Flows in all directions.

Molecular motion Negligible molecular motion Brownian molecular motion Free, constant and random molecular motion.

Intermolecular space Very less More Large

Intermolecular attraction Maximum Medium Minimum

Sound speed Fastest Faster than gas but slower than solid Lowest among all

Storage Don't need a container, for storage Cannot be stored without a container Needs closed container for storage

(b)

(i) Wood is a rigid object which has a tendency to maintain its shape when subjected to outside force.

(ii) It has a definite shape and definite volume.

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