Xiao Ming did an experiment: Pour some water into a fish tank with a length of 18 cm, a width of 15 cm, and a height of 20 cm, and then put a piece of iron to make it all submerged in the water. At this time, the measured water depth is 18 cm. After taking out the iron block, the measured water depth is 14 cm. What is the volume of this block of iron?
小明做了一个实验：在一个长18厘米，宽15厘米，高20厘米的鱼缸里倒入一些水，再放进一块铁块，使之全部没入水中．这时测得水深是18厘米，取出铁块后，测得水深是14厘米．这块铁块的体积是多少？
<gadget id="calculator">18 - 14</gadget>
<output>4</output>

<gadget id="calculator">18 * 15 * 4</gadget>
<output>1_080</output>

<result>1_080</result>