| imperial barrel | 1 bl (imp) | 2 bl (imp) | 3 bl (imp) | 4 bl (imp) | 5 bl (imp) | 6 bl (imp) | 7 bl (imp) | 8 bl (imp) | 9 bl (imp) | 10 bl (imp) | 11 bl (imp) | 12 bl (imp) | 13 bl (imp) | 14 bl (imp) | 15 bl (imp) | 16 bl (imp) | 17 bl (imp) | 18 bl (imp) | 19 bl (imp) | 20 bl (imp) | 21 bl (imp) | 22 bl (imp) | 23 bl (imp) | 24 bl (imp) | 25 bl (imp) | 26 bl (imp) | 27 bl (imp) | 28 bl (imp) | 29 bl (imp) | 30 bl (imp) | 31 bl (imp) | 32 bl (imp) | 33 bl (imp) | 34 bl (imp) | 35 bl (imp) | 36 bl (imp) | 37 bl (imp) | 38 bl (imp) | 39 bl (imp) | 40 bl (imp) | 41 bl (imp) | 42 bl (imp) | 43 bl (imp) | 44 bl (imp) | 45 bl (imp) | 46 bl (imp) | 47 bl (imp) | 48 bl (imp) | 49 bl (imp) | 50 bl (imp) | 51 bl (imp) | 52 bl (imp) | 53 bl (imp) | 54 bl (imp) | 55 bl (imp) | 56 bl (imp) | 57 bl (imp) | 58 bl (imp) | 59 bl (imp) | 60 bl (imp) | 61 bl (imp) | 62 bl (imp) | 63 bl (imp) | 64 bl (imp) | 65 bl (imp) | 66 bl (imp) | 67 bl (imp) | 68 bl (imp) | 69 bl (imp) | 70 bl (imp) | 71 bl (imp) | 72 bl (imp) | 73 bl (imp) | 74 bl (imp) | 75 bl (imp) | 76 bl (imp) | 77 bl (imp) | 78 bl (imp) | 79 bl (imp) | 80 bl (imp) | 81 bl (imp) | 82 bl (imp) | 83 bl (imp) | 84 bl (imp) | 85 bl (imp) | 86 bl (imp) | 87 bl (imp) | 88 bl (imp) | 89 bl (imp) | 90 bl (imp) | 91 bl (imp) | 92 bl (imp) | 93 bl (imp) | 94 bl (imp) | 95 bl (imp) | 96 bl (imp) | 97 bl (imp) | 98 bl (imp) | 99 bl (imp) | 100 bl (imp) |
| drop (imperial) | 1,658,880.0000015 gtt | 3,317,760.000003 gtt | 4,976,640.0000045 gtt | 6,635,520.000006 gtt | 8,294,400.0000075 gtt | 9,953,280.000009 gtt | 11,612,160.00001 gtt | 13,271,040.000012 gtt | 14,929,920.000013 gtt | 16,588,800.000015 gtt | 18,247,680.000016 gtt | 19,906,560.000018 gtt | 21,565,440.000019 gtt | 23,224,320.000021 gtt | 24,883,200.000022 gtt | 26,542,080.000024 gtt | 28,200,960.000025 gtt | 29,859,840.000027 gtt | 31,518,720.000028 gtt | 33,177,600.00003 gtt | 34,836,480.000031 gtt | 36,495,360.000033 gtt | 38,154,240.000034 gtt | 39,813,120.000036 gtt | 41,472,000.000037 gtt | 43,130,880.000039 gtt | 44,789,760.00004 gtt | 46,448,640.000042 gtt | 48,107,520.000043 gtt | 49,766,400.000045 gtt | 51,425,280.000046 gtt | 53,084,160.000048 gtt | 54,743,040.000049 gtt | 56,401,920.000051 gtt | 58,060,800.000052 gtt | 59,719,680.000054 gtt | 61,378,560.000055 gtt | 63,037,440.000057 gtt | 64,696,320.000058 gtt | 66,355,200.00006 gtt | 68,014,080.000061 gtt | 69,672,960.000063 gtt | 71,331,840.000064 gtt | 72,990,720.000066 gtt | 74,649,600.000067 gtt | 76,308,480.000069 gtt | 77,967,360.00007 gtt | 79,626,240.000072 gtt | 81,285,120.000073 gtt | 82,944,000.000075 gtt | 84,602,880.000076 gtt | 86,261,760.000078 gtt | 87,920,640.000079 gtt | 89,579,520.000081 gtt | 91,238,400.000082 gtt | 92,897,280.000084 gtt | 94,556,160.000085 gtt | 96,215,040.000087 gtt | 97,873,920.000088 gtt | 99,532,800.00009 gtt | 101,191,680.00009 gtt | 102,850,560.00009 gtt | 104,509,440.00009 gtt | 106,168,320.0001 gtt | 107,827,200.0001 gtt | 109,486,080.0001 gtt | 111,144,960.0001 gtt | 112,803,840.0001 gtt | 114,462,720.0001 gtt | 116,121,600.0001 gtt | 117,780,480.00011 gtt | 119,439,360.00011 gtt | 121,098,240.00011 gtt | 122,757,120.00011 gtt | 124,416,000.00011 gtt | 126,074,880.00011 gtt | 127,733,760.00012 gtt | 129,392,640.00012 gtt | 131,051,520.00012 gtt | 132,710,400.00012 gtt | 134,369,280.00012 gtt | 136,028,160.00012 gtt | 137,687,040.00012 gtt | 139,345,920.00013 gtt | 141,004,800.00013 gtt | 142,663,680.00013 gtt | 144,322,560.00013 gtt | 145,981,440.00013 gtt | 147,640,320.00013 gtt | 149,299,200.00013 gtt | 150,958,080.00014 gtt | 152,616,960.00014 gtt | 154,275,840.00014 gtt | 155,934,720.00014 gtt | 157,593,600.00014 gtt | 159,252,480.00014 gtt | 160,911,360.00014 gtt | 162,570,240.00015 gtt | 164,229,120.00015 gtt | 165,888,000.00015 gtt |
A barrel is one of several units of volume applied in various contexts; there are dry barrels, fluid barrels (such as the UK beer barrel and US beer barrel), oil barrels and so on. For historical reasons the volumes of some barrel units are roughly double the volumes of others; volumes in common usage range from about 100 to 200 litres (22 to 44 imp gal; 26 to 53 US gal). In many connections the term "drum" is used almost interchangeably with "barrel".
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| imperial barrel | bl (imp) | ≡ 36 gal (imp) | = 0.16365924 m3 | Imperial/US |
| imperial barrels | drops (imperial) | imperial barrels | drops (imperial) |
|---|---|---|---|
| 1 | = 1658880.0000015 | 6 | = 9953280.000009 |
| 2 | = 3317760.000003 | 7 | = 11612160.00001 |
| 3 | = 4976640.0000045 | 8 | = 13271040.000012 |
| 4 | = 6635520.000006 | 9 | = 14929920.000013 |
| 5 | = 8294400.0000075 | 10 | = 16588800.000015 |
The drop is an approximated unit of measure of volume, the amount dispensed as one drop from a dropper or drip chamber. It is often used in giving quantities of liquid drugs to patients, and occasionally in cooking.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| drop (imperial) | gtt | ≡ 1⁄288 fl oz (imp) | = 98.6564670138×10−9 m3 | Imperial/US |
| drops (imperial) | imperial barrels | drops (imperial) | imperial barrels |
|---|---|---|---|
| 1 | = 6.0281635802415E-7 | 6 | = 3.6168981481449E-6 |
| 2 | = 1.2056327160483E-6 | 7 | = 4.219714506169E-6 |
| 3 | = 1.8084490740724E-6 | 8 | = 4.8225308641932E-6 |
| 4 | = 2.4112654320966E-6 | 9 | = 5.4253472222173E-6 |
| 5 | = 3.0140817901207E-6 | 10 | = 6.0281635802415E-6 |
| imperial barrels | drops (imperial) |
|---|---|
| 1 | = 1,658,880.0000015 |
| 6.0281635802415 × 10-7 | = 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 …) |