The temperature in a certain place on January 10 is -8°C~7°C, what is the temperature difference in this day in this place?
某地1月10日的气温是-8℃～7℃，此地这一天的温差是多少℃．
<gadget id="calculator">7 - (-8)</gadget>
<output>15</output>

<result>15</result>