A piece of square steel is 1.2 meters long, and its cross section is now a square with a side length of 5 cm. If the steel weighs 7.8 grams per cubic centimeter, how many kilograms does this square steel weigh?
一段方钢长1.2米，横截现是边长为5厘米的正方形，如果每立方厘米的钢重7.8克，这希方钢重多少千克？
<gadget id="calculator">7.8 / 1_000</gadget>
<output>0.0078</output>

<gadget id="calculator">5 * 5 * 1.2 * 100 * 0.0078</gadget>
<output>23.4</output>

<result>23.4</result>