A cubic glass cylinder (measured from the inside) with side length 5 decimeters is filled with water to a depth of 1.5 decimeters. Put a cylindrical iron block with a height of 2.6 decimeters and a bottom area of 10 square decimeters in this glass jar. After the bottom surface of the iron block is completely in contact with the bottom surface of the glass jar, the water does not submerge the iron block. How many decimeters did the water level rise at this time?
一个(从内部量)棱长5分米的正方体玻璃缸，里面装有水，水深是1.5分米．在这个玻璃缸中放进高2.6分米，底面积10平方分米的圆柱体铁块，铁块底面与玻璃缸底面完全接触后，水没有淹没铁块．此时水面上升了多少分米？
<gadget id="calculator">5 * 5 * 1.5</gadget>
<output>37.5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 - 10</gadget>
<output>15</output>

<gadget id="calculator">37.5 / 15</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 - 1.5</gadget>
<output>1</output>

<result>1</result>