1Capacity or volume — the amount something can hold (e.g., storage space, container volume).
このバッグは容量が大きくて荷物がたくさん入る。
This bag has a large capacity and can hold a lot of luggage.
スマホの容量が足りないので、写真を消した。
I deleted photos because my phone didn't have enough storage capacity.
容器の容量は500ミリリットルです。
The container's capacity is 500 milliliters.
2Capacitance (abbreviated) — in physics, the ability to store electric charge.
コンデンサの容量（静電容量）は回路設計で重要な値だ。
A capacitor's capacitance is an important value in circuit design.
容量の単位はファラド（F）だが、実際はマイクロファラドなどが使われる。
The unit of capacitance is the farad (F), but microfarads are commonly used in practice.