Module: Metric Length This provides functions for conversion between metric lengths. Kilometers to Meters km_to_m(km); Meters to Kilometers m_to_km(m); Meters to Centimeters m_to_cm(m); Centimeters to Meters cm_to_m(cm); Centimeters to Millimeters cm_to_mm(cm); Millimeters to Centimeters mm_to_cm(mm);