Put an iron block (completely submerged in water) in a cubic water tank with a bottom side length of 2dm, and the water level rises by 1dm, what is the volume of this iron block in cubic decimeters?
在一个底面边长2dm的正方体水缸内放一铁块(完全浸没在水中)，水面上升1dm，这个铁块的体积是多少立方分米？
<gadget id="calculator">2 * 2 * 1</gadget>
<output>4</output>

<result>4</result>