Scientists use a shared system for reporting measurements called the International System of Units (SI). We use common measurement systems because science involves a lot of replication (i.e., repetition) to confirm results.
The SI unit of measure is so important to scientists because it is the globally accepted unit of measure. If a scientist in North American proves a theory, a scientist in Europe can then take the data, replicate the experiment used, and either confirm or disprove the theory. Without the SI measurement system, scientists could make mistakes in measurements, and those mistakes could have severe consequences.
