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| Symbol: | ppm |
| Category: | Fraction |
| SI Equivalent: | 10×10-7 |
| Dimension: | nil (fraction) |
| System: | INT |
| Notes | |
| 1 ppm = 10-6 | |
| Fraction | ||
| Symbol | Unit Name | |
| 2.4×10-5 | ct, Kt | carat (karat) |
| 1000 | ppb | part per billion |
| 1×10-4 | pph, % | part per hundred |
| 100 | pphm | part per hundred million |
| 0.1 | ppht | part per hundred thousand |
| 10×108 | ppq | part per quadrillion |
| 1×106 | ppt | part per tera |
| 10×10-4 | ppt | part per thousand |
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