If an irregular piece of iron is submerged in a 24 square centimeter melting pot, the water level rises by 2 centimeters. If the weight of iron per cubic centimeter is 7.8 grams, how much does the piece of iron weigh in kilograms?
把一块不规则的铁块浸没到底面积24平方厘米的溶器中，水面上升了2厘米，如果每立方厘米铁重7.8克，这块铁块重多少千克？
<gadget id="calculator">7.8 / 1_000</gadget>
<output>0.0078</output>

<gadget id="calculator">24 * 2 * 0.0078</gadget>
<output>0.3744</output>

<result>0.3744</result>