We could but most of the world now uses metres to measure length along with its related smaller and larger units (kilometres, micrometres etc). Furthermore, measurement units for characteristics such as litres (for volume) are directly related to metres while others such as newtons (for force, and = kilogram*metre /second2) depend on the metre along with other units). All of these would need to be re-defined, new standard measures agreed. This new set of units would then have to be learned by everyone. And for what?
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