On January 1, 2007, the highest temperature in Xi'an was 5 degrees Celsius, and the lowest temperature was -3 degrees Celsius. What is the temperature difference in Xi'an on this day?
2007年1月1日西安市的最高气温是5摄氏度，最低气温是-3摄氏度，西安市这天的温差是多少．
<gadget id="calculator">5 - (-3)</gadget>
<output>8</output>

<result>8</result>