Tank for the accumulation of oil pending transferal to a pipeline company or other purchaser.

stores water or fluid, and the heat it holds, much like a very large thermos bottle.

A compartment used to accumulate the product water from a water treatment unit so sufficient quantity and/or pressure is available for intermittent periods of higher flow rate water use.

The tank of a water heater.

A tank is a construction or a container, usually for holding liquids, sometimes for gases. The term can be used for both reservoirs (artificial lakes and ponds), and for manufactured containers. The usage of the word tank for reservoirs is common or universal in Indian English, and moderately common in British English.