Understanding US Fluid Drams to US Oil Barrels Conversion
The US fluid dram (fl-dr) is a small liquid measure of about 3.70 milliliters from the apothecaries' tradition. The US oil barrel (bbl) is the petroleum-industry standard of exactly 42 US gallons, about 158.99 liters, used to price and trade crude oil worldwide. Converting between them spans a vast range of scale, so the result is a very small number useful mainly for illustrating relative magnitude.
Conversion Formula
To convert US Fluid Drams to US Oil Barrels, multiply by this factor:
Step-by-Step Example
Convert 25 US Fluid Drams to US Oil Barrels.
How to Convert US Fluid Drams to US Oil Barrels
Converting fluid drams to oil barrels bridges a tiny apothecary measure and the 42-gallon petroleum standard.
- Note the factor: One US fluid dram equals about 0.00002325149 oil barrels.
- Multiply: Multiply the number of drams by 0.00002325149.
- Interpret: Expect a very small result, since a barrel holds 43,008 drams.
- Worked result: For 25 fluid drams, oil barrels.
US Fluid Drams to US Oil Barrels conversion table
| US Fluid Drams (fl-dr) | US Oil Barrels (bbl) |
|---|---|
| 0 | 0 |
| 1 | 0.00002325149 |
| 2 | 0.00004650298 |
| 3 | 0.00006975446 |
| 4 | 0.00009300595 |
| 5 | 0.0001162574 |
| 6 | 0.0001395089 |
| 7 | 0.0001627604 |
| 8 | 0.0001860119 |
| 9 | 0.0002092634 |
| 10 | 0.0002325149 |
| 15 | 0.0003487723 |
| 20 | 0.0004650298 |
| 25 | 0.0005812872 |
| 30 | 0.0006975446 |
| 40 | 0.0009300595 |
| 50 | 0.001162574 |
| 60 | 0.001395089 |
| 70 | 0.001627604 |
| 80 | 0.001860119 |
| 90 | 0.002092634 |
| 100 | 0.002325149 |
| 150 | 0.003487723 |
| 200 | 0.004650298 |
| 250 | 0.005812872 |
| 300 | 0.006975446 |
| 400 | 0.009300595 |
| 500 | 0.01162574 |
| 600 | 0.01395089 |
| 700 | 0.01627604 |
| 800 | 0.01860119 |
| 900 | 0.02092634 |
| 1000 | 0.02325149 |
| 2000 | 0.04650298 |
| 3000 | 0.06975446 |
| 4000 | 0.09300595 |
| 5000 | 0.1162574 |
| 10000 | 0.2325149 |
| 25000 | 0.5812872 |
| 50000 | 1.162574 |
| 100000 | 2.325149 |
| 250000 | 5.812872 |
| 500000 | 11.62574 |
| 1000000 | 23.25149 |
What is the US Fluid Dram?
The US fluid dram (also spelled fluid drachm) is a small United States customary unit of liquid volume, historically important in pharmacy and medicine for dispensing doses of liquid medication.
Definition
The US fluid dram is defined as one eighth of a US fluid ounce, or equivalently 60 minims.
Since the US fluid ounce is exactly 29.5735295625 mL, a fluid dram equals 3.6966912 mL. The UK/imperial fluid drachm is slightly larger at about 3.5516 mL (1/8 of the imperial fluid ounce).
Origin and History
"Dram" derives from the Greek drachma, an ancient coin and weight. The apothecaries' system split the fluid ounce into 8 fluid drams and each dram into 60 minims, giving pharmacists a fine graduation for compounding and measuring liquid remedies.
Law and Notable Facts
The fluid dram is a legal US customary unit but is now largely obsolete in clinical practice, superseded by milliliters. Its legacy survives in the term "dram" for a small pour of whisky and in the traditional 8-dram, 1-fluid-ounce medicine bottle.
Real-World Examples and Conversions
- A single US fluid dram is about 3.70 mL, roughly three-quarters of a metric teaspoon.
- 8 US fluid drams equal 1 US fluid ounce (29.5735 mL).
- 1 US fluid dram = 60 minims ≈ 0.75 teaspoon; 1 mL ≈ 0.2705 US fluid dram.
What is the US Oil Barrel?
The US oil barrel (bbl) is a unit of volume equal to 42 US gallons, used almost exclusively for crude oil and petroleum products. It is the standard trading unit of the global oil industry.
Definition
The US oil barrel is defined as exactly 42 US liquid gallons:
Precisely, 1 bbl = 158.987294928 liters. This differs from other "barrel" definitions: the US fluid barrel is 31.5 gallons, the US federal beer barrel is 31 gallons, and the UK barrel is about 163.66 liters.
Origin and History
The 42-gallon standard traces to the early Pennsylvania oil boom of the 1860s. Producers adopted the 42-gallon "tierce" wooden barrel, which was slightly larger than the common 40-gallon whiskey barrel, allowing for spillage and evaporation losses during transport. In 1872 the Petroleum Producers Association formalized 42 gallons as the standard, and it endures today even though oil is now moved by pipeline and tanker rather than in physical barrels.
Law and Notable Facts
The oil barrel is not an SI unit but is deeply embedded in commodity markets, where crude prices are quoted per barrel and production in barrels per day (bbl/d). The abbreviation "bbl" is thought to stand for "blue barrels" once used by Standard Oil. Physical 42-gallon barrels are rarely used in the modern industry.
Real-World Examples and Conversions
- 1 bbl = 42 US gallons ≈ 34.97 imperial gallons ≈ 158.99 liters.
- Global crude oil consumption is roughly 100 million barrels per day.
- A single barrel of crude yields about 19 to 20 US gallons of gasoline after refining.
- 1 metric ton of crude oil is roughly 7.33 barrels, depending on density.
Frequently Asked Questions
How many US oil barrels are in a US fluid dram?
One US fluid dram equals about 0.00002325149 oil barrels, an extremely small fraction because an oil barrel is enormous by comparison.
How many fluid drams are in one US oil barrel?
Exactly 43,008 fluid drams fill a single 42-gallon US oil barrel.
Why is the oil barrel 42 gallons?
The 42-gallon standard was fixed in the 19th-century American oil industry and remains the global benchmark for pricing crude oil.
What is 1000 fluid drams in oil barrels?
Multiply 1000 by 0.00002325149 to get about 0.02325 barrels.
Is the oil barrel the same as a general liquid barrel?
No. The petroleum barrel is exactly 42 US gallons, whereas the standard US liquid barrel is 31.5 gallons.