Question

) Quite often we compare materials on their heaviness, e.g., we say that iron is heavier

than wood. What do we mean by this statement? We mean that the mass of 1 c c

of iron will be more than the mass of 1 cc of wood. The mass of a unit volume of

a substance is called its density. The density is thus a measure of its heaviness; More

the density, heavier is the substance. If you have one block of iron and the other of

wood of the same size (volume) the former is heavier than the latter.

The density of a substance is mathematically given by

Mass of the body Density = Volume of that body

SI Unit of density is kg m–3. We also measure density in g/cm3.

(ii) We use spring balance for measuring weight, because, elongation in a suspended

spring is directly proportional to the load attached to its free end. Also the numerical

value of the weight of a body measured in gravitational unit (gram weight) is equal

to its mass (gram). Thus we can calibrate a spring balance to directly measure mass

in gram.

(iii) Solids and liquids have definite volumes. Solids are rigid and have definite shapes.

Liquids on the other hand acquire the shape of the containers. Different solids and

liquids differ in their densities. A solid which is denser than a liquid will sink in it

and if it is lighter than the liquid, it will float on it. If a solid sinks in a liquid, it

displaces the liquid equal to its own volume. This fact you will use while measuring

the volume of the given solid using a measuring cylinder.

Answer 1

Answer:

Yes this whole statement is true

about density , metals or non -metals etc.

Answer 2

Answer:

What is this mean is iron the space between iron molecules in iron much less than as that of wood. So in iron there is more molecules than wood in same volume. More molecules means more mass, that's why iron is much heavier than wood for same volume.

Explanation:

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dear jaxon