A rectangular parallelepiped container measures 30 cm long and 20 cm wide from the inside, and fills it with 7 cm deep water. Put a piece of steel into it, sink completely, and the water rises by 4 cm. What is the volume of this piece of steel in cubic centimeters?
一个长方体容器从里面测得长30厘米，宽20厘米，里面装7厘米深的水，将一块钢材放入，完全沉没，水面上升4厘米，这块钢材体积是多少立方厘米．
<gadget id="calculator">30 * 20 * 4</gadget>
<output>2_400</output>

<result>2_400</result>