A section of cuboid steel, 1.6 meters long, cross-section is a square with side length 4 cm. Steel weighs 7.8 grams per cubic centimeter. How many kilograms does this piece of square steel weigh?
一段长方体钢材，长1.6米，横截面是边长4厘米的正方形．每立方厘米钢重7.8克，这段方钢有多少千克？
<gadget id="calculator">7.8 / 1_000</gadget>
<output>0.0078</output>

<gadget id="calculator">4 * 4 * 1.6 * 100 * 0.0078</gadget>
<output>19.968</output>

<result>19.968</result>