The temperature in a certain city on a certain day: the lowest temperature is -3°C, the highest temperature is 3°C, what is the temperature difference on this day?
某市某天的气温：最低温度-3℃，最高温度是3℃，这天的温差是多少℃
<gadget id="calculator">3 - (-3)</gadget>
<output>6</output>

<result>6</result>