Question

1. Why does a measurement need both a 'number' and a 'unit for its complete specification?
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Answer 1

Answer:

Explanation:

A measurement must include both a number and a unit because a number is meaningless without a unit; a unit describes what the number is measuring. represents a unit of length.

For example:

Let us consider drawing a line using the scale

1) The measurement given is 9         [!? meaningless]

When there is only a number it will lead to confusion whether to draw a line for cm or m.

Hence, the above-mentioned statement is meaningless.

2) The measurement is 9 cm

Now it is easy for us to draw a line as it is mentioned to draw a line for 9 cm.