According to the forecast of the Meteorological Observatory, the temperature in Beijing on a certain day is -3℃～4℃. What is the temperature difference in this day?
据气象台预报，北京某日的气温是-3℃～4℃，这一天的温差是多少℃
<gadget id="calculator">4 - (-3)</gadget>
<output>7</output>

<result>7</result>