| fermtometer | 1 fm | 2 fm | 3 fm | 4 fm | 5 fm | 6 fm | 7 fm | 8 fm | 9 fm | 10 fm | 11 fm | 12 fm | 13 fm | 14 fm | 15 fm | 16 fm | 17 fm | 18 fm | 19 fm | 20 fm | 21 fm | 22 fm | 23 fm | 24 fm | 25 fm | 26 fm | 27 fm | 28 fm | 29 fm | 30 fm | 31 fm | 32 fm | 33 fm | 34 fm | 35 fm | 36 fm | 37 fm | 38 fm | 39 fm | 40 fm | 41 fm | 42 fm | 43 fm | 44 fm | 45 fm | 46 fm | 47 fm | 48 fm | 49 fm | 50 fm | 51 fm | 52 fm | 53 fm | 54 fm | 55 fm | 56 fm | 57 fm | 58 fm | 59 fm | 60 fm | 61 fm | 62 fm | 63 fm | 64 fm | 65 fm | 66 fm | 67 fm | 68 fm | 69 fm | 70 fm | 71 fm | 72 fm | 73 fm | 74 fm | 75 fm | 76 fm | 77 fm | 78 fm | 79 fm | 80 fm | 81 fm | 82 fm | 83 fm | 84 fm | 85 fm | 86 fm | 87 fm | 88 fm | 89 fm | 90 fm | 91 fm | 92 fm | 93 fm | 94 fm | 95 fm | 96 fm | 97 fm | 98 fm | 99 fm | 100 fm |
| palm | 1.3123359580052 × 10-14 palm | 2.6246719160105 × 10-14 palm | 3.9370078740157 × 10-14 palm | 5.249343832021 × 10-14 palm | 6.5616797900262 × 10-14 palm | 7.8740157480315 × 10-14 palm | 9.1863517060367 × 10-14 palm | 1.0498687664042 × 10-13 palm | 1.1811023622047 × 10-13 palm | 1.3123359580052 × 10-13 palm | 1.4435695538058 × 10-13 palm | 1.5748031496063 × 10-13 palm | 1.7060367454068 × 10-13 palm | 1.8372703412073 × 10-13 palm | 1.9685039370079 × 10-13 palm | 2.0997375328084 × 10-13 palm | 2.2309711286089 × 10-13 palm | 2.3622047244094 × 10-13 palm | 2.49343832021 × 10-13 palm | 2.6246719160105 × 10-13 palm | 2.755905511811 × 10-13 palm | 2.8871391076115 × 10-13 palm | 3.0183727034121 × 10-13 palm | 3.1496062992126 × 10-13 palm | 3.2808398950131 × 10-13 palm | 3.4120734908136 × 10-13 palm | 3.5433070866142 × 10-13 palm | 3.6745406824147 × 10-13 palm | 3.8057742782152 × 10-13 palm | 3.9370078740157 × 10-13 palm | 4.0682414698163 × 10-13 palm | 4.1994750656168 × 10-13 palm | 4.3307086614173 × 10-13 palm | 4.4619422572178 × 10-13 palm | 4.5931758530184 × 10-13 palm | 4.7244094488189 × 10-13 palm | 4.8556430446194 × 10-13 palm | 4.9868766404199 × 10-13 palm | 5.1181102362205 × 10-13 palm | 5.249343832021 × 10-13 palm | 5.3805774278215 × 10-13 palm | 5.511811023622 × 10-13 palm | 5.6430446194226 × 10-13 palm | 5.7742782152231 × 10-13 palm | 5.9055118110236 × 10-13 palm | 6.0367454068241 × 10-13 palm | 6.1679790026247 × 10-13 palm | 6.2992125984252 × 10-13 palm | 6.4304461942257 × 10-13 palm | 6.5616797900262 × 10-13 palm | 6.6929133858268 × 10-13 palm | 6.8241469816273 × 10-13 palm | 6.9553805774278 × 10-13 palm | 7.0866141732283 × 10-13 palm | 7.2178477690289 × 10-13 palm | 7.3490813648294 × 10-13 palm | 7.4803149606299 × 10-13 palm | 7.6115485564304 × 10-13 palm | 7.742782152231 × 10-13 palm | 7.8740157480315 × 10-13 palm | 8.005249343832 × 10-13 palm | 8.1364829396325 × 10-13 palm | 8.2677165354331 × 10-13 palm | 8.3989501312336 × 10-13 palm | 8.5301837270341 × 10-13 palm | 8.6614173228346 × 10-13 palm | 8.7926509186352 × 10-13 palm | 8.9238845144357 × 10-13 palm | 9.0551181102362 × 10-13 palm | 9.1863517060367 × 10-13 palm | 9.3175853018373 × 10-13 palm | 9.4488188976378 × 10-13 palm | 9.5800524934383 × 10-13 palm | 9.7112860892388 × 10-13 palm | 9.8425196850394 × 10-13 palm | 9.9737532808399 × 10-13 palm | 1.010498687664 × 10-12 palm | 1.0236220472441 × 10-12 palm | 1.0367454068241 × 10-12 palm | 1.0498687664042 × 10-12 palm | 1.0629921259843 × 10-12 palm | 1.0761154855643 × 10-12 palm | 1.0892388451444 × 10-12 palm | 1.1023622047244 × 10-12 palm | 1.1154855643045 × 10-12 palm | 1.1286089238845 × 10-12 palm | 1.1417322834646 × 10-12 palm | 1.1548556430446 × 10-12 palm | 1.1679790026247 × 10-12 palm | 1.1811023622047 × 10-12 palm | 1.1942257217848 × 10-12 palm | 1.2073490813648 × 10-12 palm | 1.2204724409449 × 10-12 palm | 1.2335958005249 × 10-12 palm | 1.246719160105 × 10-12 palm | 1.259842519685 × 10-12 palm | 1.2729658792651 × 10-12 palm | 1.2860892388451 × 10-12 palm | 1.2992125984252 × 10-12 palm | 1.3123359580052 × 10-12 palm |
The femtometre (American spelling femtometer, symbol fm derived from the Danish and Norwegian word femten, "fifteen"+Ancient Greek: μέτρον, metrοn, "unit of measurement") is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one. This distance can also be called a fermi and was so named in honour of physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| fermtometer | fm | 1000 attometres = 1 femtometre = 1 fermi = 0.001 picometre = 1×10−15 metres 1000000 femtometres = 10 ångström = 1 nanometre. | ≡ 1×10-15 m | Metric system SI |
| fermtometers | palms | fermtometers | palms |
|---|---|---|---|
| 1 | = 1.3123359580052E-14 | 4 | = 5.249343832021E-14 |
| 1.5 | = 1.9685039370079E-14 | 4.5 | = 5.9055118110236E-14 |
| 2 | = 2.6246719160105E-14 | 5 | = 6.5616797900262E-14 |
| 2.5 | = 3.2808398950131E-14 | 5.5 | = 7.2178477690289E-14 |
| 3 | = 3.9370078740157E-14 | 6 | = 7.8740157480315E-14 |
The palm is an obsolete anthropic unit of length, originally based on the width of the human palm and then variously standardized. The same name is also used for a second, rather larger unit based on the length of the human hand.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| palm | ≡ 3 in | = 0.0762 m | Other (Length) |
| palms | fermtometers | palms | fermtometers |
|---|---|---|---|
| 1 | = 76200000000000 | 4 | = 3.048E+14 |
| 1.5 | = 1.143E+14 | 4.5 | = 3.429E+14 |
| 2 | = 1.524E+14 | 5 | = 3.81E+14 |
| 2.5 | = 1.905E+14 | 5.5 | = 4.191E+14 |
| 3 | = 2.286E+14 | 6 | = 4.572E+14 |
| fermtometers | palms |
|---|---|
| 1 | = 1.3123359580052 × 10-14 |
| 76 200 000 000 000 | = 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 …) |