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Length/Distance | Convert from zeptometer to span |
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Common Length Conversions Metric Length Conversions Unit Definition (zeptometer) The zeptometre (or zeptometer), symbol: zm, is an SI unit of metric length measurement. 1 zeptometre is 1e-21 metres, which is a very small distance Unit Definition (span) Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.
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