MORE INFO:

Volume refers to the total amount of physical work performed in either a single workout session or over the course of an extended exercise program. In general, training volume is considered to be the product of the intensity—the specific amount of weight used per set, the number of repetitions performed and the total number of sets in a workout. Volume can also account for the time under tension or tempo (speed) of the exercises.

SOURCE:

https://www.acefitness.org/resources/pros/expert-articles/4940/how-to-select-the-right-volume-and-frequency-for-your-clients/#:~:text=In%20general%2C%20training%20volume%20is,(speed)%20of%20the%20exercises.