容積
ようせき · youseki · JLPT N2 · noun
capacity
🫙 容 (contain) + 積 (accumulate): how much a container can hold, like a jar's volume.
容 means contain and 積 means pile up or accumulate. Together they name the space something can hold, which is both capacity and volume. Sounds like 'yo-se-ki', close to 'yo-sek-i' in 'yo-seki'.