| 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) |
| picowatt | 3.938875 × 1015 pW | 7.87775 × 1015 pW | 1.1816625 × 1016 pW | 1.57555 × 1016 pW | 1.9694375 × 1016 pW | 2.363325 × 1016 pW | 2.7572125 × 1016 pW | 3.1511 × 1016 pW | 3.5449875 × 1016 pW | 3.938875 × 1016 pW | 4.3327625 × 1016 pW | 4.72665 × 1016 pW | 5.1205375 × 1016 pW | 5.514425 × 1016 pW | 5.9083125 × 1016 pW | 6.3022 × 1016 pW | 6.6960875 × 1016 pW | 7.089975 × 1016 pW | 7.4838625 × 1016 pW | 7.87775 × 1016 pW | 8.2716375 × 1016 pW | 8.665525 × 1016 pW | 9.0594125 × 1016 pW | 9.4533 × 1016 pW | 9.8471875 × 1016 pW | 1.0241075 × 1017 pW | 1.06349625 × 1017 pW | 1.102885 × 1017 pW | 1.14227375 × 1017 pW | 1.1816625 × 1017 pW | 1.22105125 × 1017 pW | 1.26044 × 1017 pW | 1.29982875 × 1017 pW | 1.3392175 × 1017 pW | 1.37860625 × 1017 pW | 1.417995 × 1017 pW | 1.45738375 × 1017 pW | 1.4967725 × 1017 pW | 1.53616125 × 1017 pW | 1.57555 × 1017 pW | 1.61493875 × 1017 pW | 1.6543275 × 1017 pW | 1.69371625 × 1017 pW | 1.733105 × 1017 pW | 1.77249375 × 1017 pW | 1.8118825 × 1017 pW | 1.85127125 × 1017 pW | 1.89066 × 1017 pW | 1.93004875 × 1017 pW | 1.9694375 × 1017 pW | 2.00882625 × 1017 pW | 2.048215 × 1017 pW | 2.08760375 × 1017 pW | 2.1269925 × 1017 pW | 2.16638125 × 1017 pW | 2.20577 × 1017 pW | 2.24515875 × 1017 pW | 2.2845475 × 1017 pW | 2.32393625 × 1017 pW | 2.363325 × 1017 pW | 2.40271375 × 1017 pW | 2.4421025 × 1017 pW | 2.48149125 × 1017 pW | 2.52088 × 1017 pW | 2.56026875 × 1017 pW | 2.5996575 × 1017 pW | 2.63904625 × 1017 pW | 2.678435 × 1017 pW | 2.71782375 × 1017 pW | 2.7572125 × 1017 pW | 2.79660125 × 1017 pW | 2.83599 × 1017 pW | 2.87537875 × 1017 pW | 2.9147675 × 1017 pW | 2.95415625 × 1017 pW | 2.993545 × 1017 pW | 3.03293375 × 1017 pW | 3.0723225 × 1017 pW | 3.11171125 × 1017 pW | 3.1511 × 1017 pW | 3.19048875 × 1017 pW | 3.2298775 × 1017 pW | 3.26926625 × 1017 pW | 3.308655 × 1017 pW | 3.34804375 × 1017 pW | 3.3874325 × 1017 pW | 3.42682125 × 1017 pW | 3.46621 × 1017 pW | 3.50559875 × 1017 pW | 3.5449875 × 1017 pW | 3.58437625 × 1017 pW | 3.623765 × 1017 pW | 3.66315375 × 1017 pW | 3.7025425 × 1017 pW | 3.74193125 × 1017 pW | 3.78132 × 1017 pW | 3.82070875 × 1017 pW | 3.8600975 × 1017 pW | 3.89948625 × 1017 pW | 3.938875 × 1017 pW |
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 | picowatts | imperial ton of refrigerations | picowatts |
|---|---|---|---|
| 1 | ≈ 3.938875E+15 | 6 | ≈ 2.363325E+16 |
| 2 | ≈ 7.87775E+15 | 7 | ≈ 2.7572125E+16 |
| 3 | ≈ 1.1816625E+16 | 8 | ≈ 3.1511E+16 |
| 4 | ≈ 1.57555E+16 | 9 | ≈ 3.5449875E+16 |
| 5 | ≈ 1.9694375E+16 | 10 | ≈ 3.938875E+16 |
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 | imperial ton of refrigerations | picowatts | imperial ton of refrigerations |
|---|---|---|---|
| 1 | ≈ 2.5387959760084E-16 | 6 | ≈ 1.523277585605E-15 |
| 2 | ≈ 5.0775919520168E-16 | 7 | ≈ 1.7771571832059E-15 |
| 3 | ≈ 7.6163879280251E-16 | 8 | ≈ 2.0310367808067E-15 |
| 4 | ≈ 1.0155183904034E-15 | 9 | ≈ 2.2849163784075E-15 |
| 5 | ≈ 1.2693979880042E-15 | 10 | ≈ 2.5387959760084E-15 |
| imperial ton of refrigerations | picowatts |
|---|---|
| 1 | ≈ 3.938875 × 1015 |
| 2.5387959760084 × 10-16 | ≈ 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 …) |