📏¹⁰⁻⁹m
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#scale
#metric system
#unit
#length
#power of ten
#billionth
#standard
1️⃣/🅱️
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#parts per billion
#ratio
#billionth
🤏/🌍
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#parts per billion
#trace amount
#tiny fraction
#ratio
#billionth
🔬/🅱️
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#parts per billion
#microscopic
#trace analysis
#billionth
#scale #metric system #unit #length #power of ten #billionth #standard