How do you fin volume?

Volume is quantity or power of sound. To change the volume on a string instrument you must have a confined area of air so the vibrations have more energy to make the sound louder.But for Math, Volume is the measurement for how much you can fit inside an object. eg. A water bottle is 5cm wide(radius is 2.5) and 10 cm tall(Hight). Radius X Hight = Volume. 2.5cm X 10cm = 196.42cm3The Water Bottles Volume is 196.42cm3 (Cubic Centimeters)