Question

why are we not using rod to measure standard unit explain ??​

Answer 1

Answer:

1. The Standard unit of measuring length is called meter.

2. But hand span, forearm length, and footstep cannot be used as standard units measurements because their length is not the same for all persons.

3. The length of hands pan, forearm length, and footstep of different persons is different. It varies from person to person.

Answer 2

• As we know that when temperature increases, a rod can be expanded.
• When a temperature decreases, the rod can be contracted.

• The exact rod with the same length can not easily be reproducible.

• Hence, we are not using the rod to measure standard unit explain.