Put some water in a fish tank with a length of 8dm, a width of 4.5dm, and a depth of 4.5dm, and immerse a piece of iron with a volume of 21.6 cubic decimeters in the water. How much will the water level drop if the iron block is removed from the water?
在一个长8dm，宽4.5dm，深4.5dm的鱼缸里放入一些水，并在水中浸入一块体积为21.6立方分米的铁块．如果把铁块从水中取出，水面将下降多少？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">21.6 / 32</gadget>
<output>0.675</output>

<result>0.675</result>