This is the 604th most frequent Portuguese word.
volume
The amount of space that a substance or object occupies; also, the level of sound or loudness.
The word 'volume' here refers to the sound intensity or level produced by the radio.
Eu ajustei o volume do rádio para poder ouvir melhor a música.
I adjusted the volume of the radio to better hear the music.
In this sentence, 'volume' pertains to the quantity of space occupied within the reservoir.
O volume do reservatório de água está quase cheio.
The volume of the water reservoir is almost full.
Here, 'volume' represents a book or a part of a series, emphasizing its bibliographical usage.