femtowatt | 1 fW | 2 fW | 3 fW | 4 fW | 5 fW | 6 fW | 7 fW | 8 fW | 9 fW | 10 fW | 11 fW | 12 fW | 13 fW | 14 fW | 15 fW | 16 fW | 17 fW | 18 fW | 19 fW | 20 fW | 21 fW | 22 fW | 23 fW | 24 fW | 25 fW | 26 fW | 27 fW | 28 fW | 29 fW | 30 fW | 31 fW | 32 fW | 33 fW | 34 fW | 35 fW | 36 fW | 37 fW | 38 fW | 39 fW | 40 fW | 41 fW | 42 fW | 43 fW | 44 fW | 45 fW | 46 fW | 47 fW | 48 fW | 49 fW | 50 fW | 51 fW | 52 fW | 53 fW | 54 fW | 55 fW | 56 fW | 57 fW | 58 fW | 59 fW | 60 fW | 61 fW | 62 fW | 63 fW | 64 fW | 65 fW | 66 fW | 67 fW | 68 fW | 69 fW | 70 fW | 71 fW | 72 fW | 73 fW | 74 fW | 75 fW | 76 fW | 77 fW | 78 fW | 79 fW | 80 fW | 81 fW | 82 fW | 83 fW | 84 fW | 85 fW | 86 fW | 87 fW | 88 fW | 89 fW | 90 fW | 91 fW | 92 fW | 93 fW | 94 fW | 95 fW | 96 fW | 97 fW | 98 fW | 99 fW | 100 fW |
picowatt | 0.001 pW | 0.002 pW | 0.003 pW | 0.004 pW | 0.005 pW | 0.006 pW | 0.007 pW | 0.008 pW | 0.009 pW | 0.01 pW | 0.011 pW | 0.012 pW | 0.013 pW | 0.014 pW | 0.015 pW | 0.016 pW | 0.017 pW | 0.018 pW | 0.019 pW | 0.02 pW | 0.021 pW | 0.022 pW | 0.023 pW | 0.024 pW | 0.025 pW | 0.026 pW | 0.027 pW | 0.028 pW | 0.029 pW | 0.03 pW | 0.031 pW | 0.032 pW | 0.033 pW | 0.034 pW | 0.035 pW | 0.036 pW | 0.037 pW | 0.038 pW | 0.039 pW | 0.04 pW | 0.041 pW | 0.042 pW | 0.043 pW | 0.044 pW | 0.045 pW | 0.046 pW | 0.047 pW | 0.048 pW | 0.049 pW | 0.05 pW | 0.051 pW | 0.052 pW | 0.053 pW | 0.054 pW | 0.055 pW | 0.056 pW | 0.057 pW | 0.058 pW | 0.059 pW | 0.06 pW | 0.061 pW | 0.062 pW | 0.063 pW | 0.064 pW | 0.065 pW | 0.066 pW | 0.067 pW | 0.068 pW | 0.069 pW | 0.07 pW | 0.071 pW | 0.072 pW | 0.073 pW | 0.074 pW | 0.075 pW | 0.076 pW | 0.077 pW | 0.078 pW | 0.079 pW | 0.08 pW | 0.081 pW | 0.082 pW | 0.083 pW | 0.084 pW | 0.085 pW | 0.086 pW | 0.087 pW | 0.088 pW | 0.089 pW | 0.09 pW | 0.091 pW | 0.092 pW | 0.093 pW | 0.094 pW | 0.095 pW | 0.096 pW | 0.097 pW | 0.098 pW | 0.099 pW | 0.1 pW |
The femtowatt (fW) is equal to one quadrillionth (10−15) of a watt. Technologically important powers that are measured in femtowatts are typically found in reference(s) to radio and radar receivers. For example, meaningful FM tuner performance figures for sensitivity, quieting and signal-to-noise require that the RF energy applied to the antenna input be specified. These input levels are often stated in dBf (decibels referenced to 1 femtowatt). This is 0.2739 microvolt across a 75-ohm load or 0.5477 microvolt across a 300-ohm load; the specification takes into account the RF input impedance of the tuner.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
femtowatt | fW | = 10-15 W | = 10-15 W | Metric system SI |
femtowatts | picowatts | femtowatts | picowatts |
---|---|---|---|
1 | = 0.001 | 6 | = 0.006 |
2 | = 0.002 | 7 | = 0.007 |
3 | = 0.003 | 8 | = 0.008 |
4 | = 0.004 | 9 | = 0.009 |
5 | = 0.005 | 10 | = 0.01 |
The picowatt (pW), not to be confused with the much larger petawatt (PW), is equal to one trillionth (10−12) of a watt. Technologically important powers that are measured in picowatts are typically used in reference to radio and radar receivers, acoustics and in the science of radio astronomy.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
picowatt | pW | = 10-12 W | = 10-12 W | Metric system SI |
picowatts | femtowatts | picowatts | femtowatts |
---|---|---|---|
1 | = 1000 | 6 | = 6000 |
2 | = 2000 | 7 | = 7000 |
3 | = 3000 | 8 | = 8000 |
4 | = 4000 | 9 | = 9000 |
5 | = 5000 | 10 | = 10000 |
femtowatts | picowatts |
---|---|
1 | = 0.001 |
1 000 | = 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |