| imperial ton of refrigeration | 1 TR (imperial) | 2 TR (imperial) | 3 TR (imperial) | 4 TR (imperial) | 5 TR (imperial) | 6 TR (imperial) | 7 TR (imperial) | 8 TR (imperial) | 9 TR (imperial) | 10 TR (imperial) | 11 TR (imperial) | 12 TR (imperial) | 13 TR (imperial) | 14 TR (imperial) | 15 TR (imperial) | 16 TR (imperial) | 17 TR (imperial) | 18 TR (imperial) | 19 TR (imperial) | 20 TR (imperial) | 21 TR (imperial) | 22 TR (imperial) | 23 TR (imperial) | 24 TR (imperial) | 25 TR (imperial) | 26 TR (imperial) | 27 TR (imperial) | 28 TR (imperial) | 29 TR (imperial) | 30 TR (imperial) | 31 TR (imperial) | 32 TR (imperial) | 33 TR (imperial) | 34 TR (imperial) | 35 TR (imperial) | 36 TR (imperial) | 37 TR (imperial) | 38 TR (imperial) | 39 TR (imperial) | 40 TR (imperial) | 41 TR (imperial) | 42 TR (imperial) | 43 TR (imperial) | 44 TR (imperial) | 45 TR (imperial) | 46 TR (imperial) | 47 TR (imperial) | 48 TR (imperial) | 49 TR (imperial) | 50 TR (imperial) | 51 TR (imperial) | 52 TR (imperial) | 53 TR (imperial) | 54 TR (imperial) | 55 TR (imperial) | 56 TR (imperial) | 57 TR (imperial) | 58 TR (imperial) | 59 TR (imperial) | 60 TR (imperial) | 61 TR (imperial) | 62 TR (imperial) | 63 TR (imperial) | 64 TR (imperial) | 65 TR (imperial) | 66 TR (imperial) | 67 TR (imperial) | 68 TR (imperial) | 69 TR (imperial) | 70 TR (imperial) | 71 TR (imperial) | 72 TR (imperial) | 73 TR (imperial) | 74 TR (imperial) | 75 TR (imperial) | 76 TR (imperial) | 77 TR (imperial) | 78 TR (imperial) | 79 TR (imperial) | 80 TR (imperial) | 81 TR (imperial) | 82 TR (imperial) | 83 TR (imperial) | 84 TR (imperial) | 85 TR (imperial) | 86 TR (imperial) | 87 TR (imperial) | 88 TR (imperial) | 89 TR (imperial) | 90 TR (imperial) | 91 TR (imperial) | 92 TR (imperial) | 93 TR (imperial) | 94 TR (imperial) | 95 TR (imperial) | 96 TR (imperial) | 97 TR (imperial) | 98 TR (imperial) | 99 TR (imperial) | 100 TR (imperial) |
| microwatt | 3 938 875 000 µW | 7 877 750 000 µW | 11 816 625 000 µW | 15 755 500 000 µW | 19 694 375 000 µW | 23 633 250 000 µW | 27 572 125 000 µW | 31 511 000 000 µW | 35 449 875 000 µW | 39 388 750 000 µW | 43 327 625 000 µW | 47 266 500 000 µW | 51 205 375 000 µW | 55 144 250 000 µW | 59 083 125 000 µW | 63 022 000 000 µW | 66 960 875 000 µW | 70 899 750 000 µW | 74 838 625 000 µW | 78 777 500 000 µW | 82 716 375 000 µW | 86 655 250 000 µW | 90 594 125 000 µW | 94 533 000 000 µW | 98 471 875 000 µW | 102 410 750 000 µW | 106 349 625 000 µW | 110 288 500 000 µW | 114 227 375 000 µW | 118 166 250 000 µW | 122 105 125 000 µW | 126 044 000 000 µW | 129 982 875 000 µW | 133 921 750 000 µW | 137 860 625 000 µW | 141 799 500 000 µW | 145 738 375 000 µW | 149 677 250 000 µW | 153 616 125 000 µW | 157 555 000 000 µW | 161 493 875 000 µW | 165 432 750 000 µW | 169 371 625 000 µW | 173 310 500 000 µW | 177 249 375 000 µW | 181 188 250 000 µW | 185 127 125 000 µW | 189 066 000 000 µW | 193 004 875 000 µW | 196 943 750 000 µW | 200 882 625 000 µW | 204 821 500 000 µW | 208 760 375 000 µW | 212 699 250 000 µW | 216 638 125 000 µW | 220 577 000 000 µW | 224 515 875 000 µW | 228 454 750 000 µW | 232 393 625 000 µW | 236 332 500 000 µW | 240 271 375 000 µW | 244 210 250 000 µW | 248 149 125 000 µW | 252 088 000 000 µW | 256 026 875 000 µW | 259 965 750 000 µW | 263 904 625 000 µW | 267 843 500 000 µW | 271 782 375 000 µW | 275 721 250 000 µW | 279 660 125 000 µW | 283 599 000 000 µW | 287 537 875 000 µW | 291 476 750 000 µW | 295 415 625 000 µW | 299 354 500 000 µW | 303 293 375 000 µW | 307 232 250 000 µW | 311 171 125 000 µW | 315 110 000 000 µW | 319 048 875 000 µW | 322 987 750 000 µW | 326 926 625 000 µW | 330 865 500 000 µW | 334 804 375 000 µW | 338 743 250 000 µW | 342 682 125 000 µW | 346 621 000 000 µW | 350 559 875 000 µW | 354 498 750 000 µW | 358 437 625 000 µW | 362 376 500 000 µW | 366 315 375 000 µW | 370 254 250 000 µW | 374 193 125 000 µW | 378 132 000 000 µW | 382 070 875 000 µW | 386 009 750 000 µW | 389 948 625 000 µW | 393 887 500 000 µW |
A ton of refrigeration (TR), also called a refrigeration ton (RT), is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| imperial ton of refrigeration | TR (imperial) | ≡ 2240 lb × iceIT / 24 h: iceIT = 144 °F × 2326 J/kg·°F | ≈ 3.938875×103 W | Imperial/US |
| imperial ton of refrigerations | microwatts | imperial ton of refrigerations | microwatts |
|---|---|---|---|
| 1 | ≈ 3938875000 | 6 | ≈ 23633250000 |
| 2 | ≈ 7877750000 | 7 | ≈ 27572125000 |
| 3 | ≈ 11816625000 | 8 | ≈ 31511000000 |
| 4 | ≈ 15755500000 | 9 | ≈ 35449875000 |
| 5 | ≈ 19694375000 | 10 | ≈ 39388750000 |
The microwatt (µW) is equal to one millionth (10−6) of a watt. Important powers that are measured in microwatts are typically stated in medical instrumentation systems such as the EEG and the ECG, in a wide variety of scientific and engineering instruments and also in reference to radio and radar receivers. Compact solar cells for devices such as calculators and watches are typically measured in microwatts.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| microwatt | µW | = 10-6 W | = 10-6 W | Metric system SI |
| microwatts | imperial ton of refrigerations | microwatts | imperial ton of refrigerations |
|---|---|---|---|
| 1 | ≈ 2.5387959760084E-10 | 6 | ≈ 1.523277585605E-9 |
| 2 | ≈ 5.0775919520168E-10 | 7 | ≈ 1.7771571832059E-9 |
| 3 | ≈ 7.6163879280251E-10 | 8 | ≈ 2.0310367808067E-9 |
| 4 | ≈ 1.0155183904034E-9 | 9 | ≈ 2.2849163784075E-9 |
| 5 | ≈ 1.2693979880042E-9 | 10 | ≈ 2.5387959760084E-9 |
| imperial ton of refrigerations | microwatts |
|---|---|
| 1 | ≈ 3 938 875 000 |
| 2.5387959760084 × 10-10 | ≈ 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 …) |