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| Symbol: | ppt |
| Category: | Fraction |
| SI Equivalent: | 10×10-13 |
| Dimension: | nil (fraction) |
| System: | INT |
| Notes | |
| 1 ppt = 10-12 | |
| Fraction | ||
| Symbol | Unit Name | |
| 2.4×10-11 | ct, Kt | carat (karat) |
| 1×10-3 | ppb | part per billion |
| 1×10-10 | pph, % | part per hundred |
| 1×10-4 | pphm | part per hundred million |
| 1×10-7 | ppht | part per hundred thousand |
| 10×10-7 | ppm | part per million |
| 1000 | ppq | part per quadrillion |
| 10×10-10 | ppt | part per thousand |
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