How to Say "volume" in Spanish
The most common Spanish word for “volume” is “volumen” — use 'volumen' when referring to the loudness of sound or the amount of physical space something occupies, like hair fullness or the size of an object.
volumen
boh-LOO-mehnboˈlumen

Examples
Sube el volumen de la radio, por favor.
Turn up the volume of the radio, please.
El volumen está muy bajo y no oigo nada.
The volume is very low and I can't hear anything.
Baja el volumen, que los niños están durmiendo.
Turn the volume down, the children are sleeping.
Este champú da mucho volumen al pelo.
This shampoo gives the hair a lot of volume.
The Hidden Accent
When you make this word plural, it needs a written accent mark: 'volúmenes'. This is to keep the emphasis on the same syllable when extra letters are added.
Describing Size
Use 'mucho volumen' to describe things that are bulky or fluffy, not just things that are 'big'.
Books vs. Volumes
While 'libro' is a general book, 'volumen' or 'tomo' specifically refers to one part of a larger set.
Gender Trap
Mistake: “la volumen”
Correction: el volumen (it is a masculine noun).
volumen
boh-LOO-mehnboˈlumen

Examples
He comprado el segundo volumen de la enciclopedia.
I bought the second volume of the encyclopedia.
Sube el volumen de la radio, por favor.
Turn up the volume of the radio, please.
El volumen está muy bajo y no oigo nada.
The volume is very low and I can't hear anything.
Baja el volumen, que los niños están durmiendo.
Turn the volume down, the children are sleeping.
The Hidden Accent
When you make this word plural, it needs a written accent mark: 'volúmenes'. This is to keep the emphasis on the same syllable when extra letters are added.
Describing Size
Use 'mucho volumen' to describe things that are bulky or fluffy, not just things that are 'big'.
Books vs. Volumes
While 'libro' is a general book, 'volumen' or 'tomo' specifically refers to one part of a larger set.
Gender Trap
Mistake: “la volumen”
Correction: el volumen (it is a masculine noun).
capacidad
kah-pah-see-dahdkapaˈsiðað

Examples
El estadio tiene una capacidad para 50,000 espectadores.
The stadium has a capacity for 50,000 spectators.
El disco duro no tiene suficiente capacidad para guardar más archivos.
The hard drive doesn't have enough capacity (storage) to save more files.
La capacidad de la batería es de 5000 miliamperios.
The battery capacity is 5000 milliamperes.
Measure Words
When discussing physical volume, 'capacidad' often pairs with numbers and units of measure, such as 'capacidad para 10 litros' (capacity for 10 liters).
tomo
TOH-mohˈto.mo

Examples
La enciclopedia tiene diez tomos en total.
The encyclopedia has ten volumes in total.
Solo he leído el primer tomo de la saga.
I have only read the first volume of the saga.
El tomo final se publicará el próximo año.
The final volume will be published next year.
Gender Reminder
Remember that 'tomo' (volume) is masculine, so it uses 'el' and 'un': 'el tomo grande' (the large volume).
caudal
kow-DAHLkawˈdal

Examples
Después de la tormenta, el caudal del río aumentó peligrosamente.
After the storm, the river's flow increased dangerously.
Este grifo tiene muy poco caudal de agua.
This tap has a very low water flow.
Es necesario medir el caudal para evitar inundaciones.
It is necessary to measure the volume of flow to avoid floods.
Always Masculine
Even though it ends in 'l', it is a masculine noun. Always use 'el' or 'un' with it.
Confusing flow with the river itself
Mistake: “El caudal es muy largo.”
Correction: El río es muy largo (o) El caudal es muy grande.
Confusing 'Volumen' with 'Capacidad'
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