rectangular parallelepiped glass container whose bottom surface is 2 decimeters in length and width contains 8 liters of water. An iron ball is immersed in the water, and the water depth is 2.5 decimeters. What is the volume of this iron ball?
一个底面长和宽都是2分米的长方体玻璃容器，里面装有8升水，将一个铁球浸没在水中，这时水深2.5分米．这个铁球的体积是多少？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2.5 - 2</gadget>
<output>0.5</output>

<gadget id="calculator">2 * 2 * 0.5</gadget>
<output>2</output>

<result>2</result>