Fluid Ounces: US vs Imperial
Same Name, Different Volumes
Learn el/la DifferenceEl/La fluid onza might seem like un/una simple measurement, pero eso comes in two confusingly diferente sizes. Un/Una US fluid onza es slightly larger than un/una imperial fluid onza—yet un/una US taza (8 fl oz) es smaller than un/una imperial taza (10 fl oz). This guia untangles el/la fluid onza confusion.
Side-by-Side Comparison
| Attribute | US Fluid Ounce | Imperial Fluid Ounce |
|---|---|---|
| Volumen | 29.57 mL | 28.41 mL |
| Relationship un/una pint | 16 fl oz = 1 pint | 20 fl oz = 1 pint |
| Relationship un/una galon | 128 fl oz = 1 galon | 160 fl oz = 1 galon |
| Symbol | fl oz (US) | fl oz (imp) |
| Used in | United States | UK, Canada, Ireland |
Why Are They Different?
El/La split traces back un/una 1824 cuando Britain reformed su measurement sistema. Before eso, ambos countries usado similar fluid onzas. Here's que happened:
El/La US Fluid Ounce
Derived desde el/la wine galon eso el/la American colonies usado. El/La US galon (128 fluid onzas) fue defined as 231 cubic pulgadas, making cada US fluid onza aproximadamente 1.8 cubic pulgadas.
El/La Imperial Fluid Ounce
When Britain created el/la imperial sistema in 1824, ellos defined el/la galon as el/la volume of 10 libras of water. This larger galon (160 fluid onzas) has un/una slightly smaller individual fluid onza.
Tabla de conversion
| US Fluid Ounces | Imperial Fluid Ounces | Milliliters |
|---|---|---|
| 1 US fl oz | 1.041 imp fl oz | 29.57 mL |
| 8 US fl oz (1 taza) | 8.33 imp fl oz | 236.6 mL |
| 16 US fl oz (1 pint) | 16.65 imp fl oz | 473.2 mL |
| 32 US fl oz (1 quart) | 33.31 imp fl oz | 946.4 mL |
| 128 US fl oz (1 galon) | 133.2 imp fl oz | 3,785 mL |
Conversion Formulas
US un/una Imperial
Imperial fl oz = US fl oz × 1.0408
Ejemplo: 12 US fl oz × 1.0408 = 12.49 imperial fl oz
Imperial un/una US
US fl oz = Imperial fl oz × 0.9608
Ejemplo: 12 imperial fl oz × 0.9608 = 11.53 US fl oz
Either un/una Metric
- US fl oz un/una mL: Multiplica por 29.57
- Imperial fl oz un/una mL: Multiplica por 28.41
- mL un/una US fl oz: Divide por 29.57
- mL un/una Imperial fl oz: Divide por 28.41
Practical Implications
Cooking y Recipes
Most recipes don't specify cual fluid onza ellos mean. Rules of thumb:
- American recipes usar US fluid onzas
- British recipes may usar imperial fluid onzas (pero increasingly usar metric)
- For small amounts, el/la 4% difference es negligible
- For large batches, usar metric (mL) for clarity
Beverage Bottles
Bottle sizes often differ entre countries:
| Product | US Market | UK Market |
|---|---|---|
| "12 oz" soda | 355 mL (12 US fl oz) | 330 mL (typical) |
| Beer pint | 473 mL (16 US fl oz) | 568 mL (20 imp fl oz) |
| Wine bottle | 750 mL (estandar) | 750 mL (estandar) |
Fluid Ounces vs Peso Ounces
Don't confuse fluid onzas (volume) with regular onzas (weight). They medir diferente things:
- Fluid onza: Measures volume (como mucho space something takes up)
- Ounce (oz): Measures weight/mass (como heavy something es)
For water, 1 US fluid onza weighs almost exactamente 1 avoirdupois onza—pero esto es un/una coincidence eso doesn't hold for otro liquids. Honey, oil, y alcohol have diferente densities, asi que su weight per fluid onza varies.
Where Each Is Used Today
US Fluid Ounces
- United States (beverages, cooking, medicine)
- US food exports
- Some Latin American countries
Imperial Fluid Ounces
- United Kingdom (decreasing usar)
- Canada (mainly for beer)
- Ireland
- Some Caribbean nations
Metric (Most of el/la World)
Most countries usar milliliters exclusively. Even el/la UK y Canada have largely transitioned un/una metric for cotidiano usar, keeping fluid onzas mainly for beer y traditional recipes.
Conclusion
El/La US y imperial fluid onzas son close enough eso small measurements son interchangeable, pero el/la 4% difference adds up in larger quantities. When precision matters—o cuando working with internacional recipes—convertir un/una milliliters for clarity.
Remember: el/la US fluid onza es larger (29.57 mL vs 28.41 mL), pero alli son fewer of them in un/una galon (128 vs 160).