In which context would you encounter the term "capacitance"?

Capacitance refers specifically to the ability of a system to store electrical charge. It is a fundamental property of capacitors, which are components used in electronic circuits to store energy in an electric field. The higher the capacitance, the more charge a capacitor can store for a given voltage. This characteristic is important in various applications, such as smoothing out voltage fluctuations, filtering signals, and temporary energy storage in power supplies.

In contrast, the other contexts do not involve electrical charge storage. The storage of water relates more to concepts of volume and pressure rather than electrical properties. Measuring temperature pertains to thermal energy and does not overlap with electrical charge concepts. Calculating voltage involves the relationships of electrical properties but does not specifically address the storage capability of a component, which is the essence of capacitance. Hence, the context where "capacitance" is relevant is clearly found in the storage of electrical charge.