cube container with a side length of 3 decimeters measured from the inside is filled with water at a height of 1.8 decimeters. Now a piece of iron is completely submerged in the water, and the height of the water surface rises to 2.6 decimeters. What is the volume of this iron block?
一个从里面量棱长是3分米的正方体容器，盛有1.8分米高的水，现把一块铁块完全浸没在水中，水面高度上升到2.6分米．这块铁块体积是多少？
<gadget id="calculator">2.6 - 1.8</gadget>
<output>0.8</output>

<gadget id="calculator">3 * 3 * 0.8</gadget>
<output>7.2</output>

<result>7.2</result>