How to visualize one part per million - Kim Preshoff + The TED-Ed Community | IELTS, ESP, EAP and CALL | Scoop.it
From ed.ted.com - August 21, 2016 3:31 AM
“Parts per million” is a scientific unit of measurement that counts the number of units of one substance per one million units of another. But because it’s hard to conceptualize really larg