Solar energy can be stored by raising the temperature of water or rocks. A storage system will lose.

Solar energy can be stored by raising the temperature of water or rocks. A storage system will lose its stored energy by heat losses from the holding tank to the outside air. Even though water is a poor conductor of heat, the circulation of the warmer water to the top and colder water to the bottom will transfer heat within the tank. With this background, why are rock piles (or small pebbles) good energy storage materials for the heat energy removed from hot air even though their heat capacity is small?

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