| Physical quantity | Unit name | Unit symbol | Expression in SI units |
|---|---|---|---|
| activity (of a radionuclide) | curie | Ci | 3.7 x 1010 Bq |
| exposure (x and γ rays) | röntgen | R | 2.58 x 10-4 C kg s-1 |
| absorbed dose | rad | rad | cGy = 10-2 Gy |
| dose equivalent | rem | rem | cSv = 10-2 Sv |
| length (x-ray wavelength) | X unit | - | 1.002 x 10-4 nm approximately |
| magnetic induction | gamma | γ | nT = 10-9 T |
| flux, radio astronomy | jansky | Jy | 10-26 W m-2 Hz-1 |
| length | fermi | - | fm = 10-15 m |
| mass | metric carat | - | 200 mg = 2 x 10-4 kg |
| pressure | torr | Torr | (101 325/760) Pa |
| pressure | standard atmosphere | atm | 760 mmHg = 101 325 Pa |
| pressure | millimeter of mercury | mmHg | 133.322 39 Pa |
| energy | thermochemical calorie | calth | 4.184 J |
| length | micron | µ | 1 µm = 10-6 m |
| time | year | a | 365.242 199 days = 31 556 925.974 7 s |
| force | kilogram-force | kgf | 9.806 65 N |
The table above lists units which are common in older texts and also some are units derived directly from a measurement system like barometric pressure measurement in mmHg. For current texts, it should be noted that if these units are used the advantages of the SI are lost. The relation of these units to the SI should be specified in every document in which they are used.
Si Units:
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