After adopting the new technology, a chemical fertilizer factory now uses 14 tons of raw materials every day. The raw materials used for 7 days can now be used for 10 days. How many tons of raw materials are used less per day in this factory than before the new technology? (Use the proportional method to answer, and write out the judgment process)
某化肥厂采用新技术后，现在每天用原料14吨，原来7天用的原料，现在可以用10天．这个厂现在每天比新技术前每天少用原料多少吨？(用比例方法解答，并写出判断过程)
<gadget id="calculator">14 * 10</gadget>
<output>140</output>

<gadget id="calculator">14 * 7</gadget>
<output>98</output>

<gadget id="calculator">140 - 98</gadget>
<output>42</output>

<gadget id="calculator">42 / 7</gadget>
<output>6</output>

<result>6</result>