A cube stone, the side length is 2dm, if every 1dm**3 stone weighs 2.5kg, how many kilograms does this stone weigh?
一块正方体石块，棱长是2dm，如果每1dm**3的石块重2.5kg，这块石块重多少千克？
<gadget id="calculator">2 * 2 * 2 * 2.5</gadget>
<output>20</output>

<result>20</result>