Question

Why can't we measure all length in one standard unit such as meter instead of multiples and submulriples

Answer 1

Answer:

All lengths cannot be measured by just one unit (such as meter) because for certain sizes, it becomes very inconvenient to use meters.

Eg: 1) The distance of Earth from the Sun in meters is, 149,600,000,000m. If we use kilometers, it is :

149,600,000km. But for convenience sake, we use q unit called an Astronomical unit.

If we use this , the distance is just: 1au

2) For measuring really small things like microbes, or subatomic particles.

Size of an average bacterium is 0.0000011m

Size of a proton is 0.000000000000000877m

So, for convenience, we use micrometers or femtometers.