A cuboid glass container, measured from the inside, is 2 decimeters in length and width. Pour 5.5 liters of water into the container, and then put a potato into the water. At this time, the water depth in the container is measured to be 1.5 decimeters. What is the volume of this potato?
一个长方体玻璃容器，从里面量长宽均为2分米，向容器中倒入5.5升水，再把一个土豆放入水中，这时量得容器内的水深是1.5分米．这个土豆的体积是多少？
<gadget id="calculator">5.5 / 2 / 2</gadget>
<output>1.375</output>

<gadget id="calculator">1.5 - 1.375</gadget>
<output>0.125</output>

<gadget id="calculator">2 * 2 * 0.125</gadget>
<output>0.5</output>

<result>0.5</result>