part per hundred million
| Symbol: | pphm |
| Category: | Fraction |
| SI Equivalent: | 10×10-9 |
| Dimension: | nil (fraction) |
| System: | INT |
| Notes | |
| 1 pphm = 10-8 | |
1 pphm =
| Fraction | ||
| Symbol | Unit Name | |
| 2.4×10-7 | ct, Kt | carat (karat) |
| 10 | ppb | part per billion |
| 1×10-6 | pph, % | part per hundred |
| 1×10-3 | ppht | part per hundred thousand |
| 10×10-3 | ppm | part per million |
| 10×106 | ppq | part per quadrillion |
| 10000 | ppt | part per tera |
| 10×10-6 | ppt | part per thousand |















