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小明同学学习了“声音的产生与传播”后知道了声速的大小跟介质的种类有关，还跟介质的温度有关．于是他思考：声音在空气中传播的速度与温度有什么具体的关系呢？在老师的指导下他收集到了如下表所示的一组数据． 空气温度/℃ -20 -10 0 10 20 30 声音速度/（m?s -1 ） 319 325 331 337 343 349 说一说：阅读分析表中的数据，你知道声音在空气中传播的速度与温度有什么具体关系吗？ 用一用：请你利用表中获得的信息，分析完成下列问题． （1）请你根据表中数据分析出空气温度为15℃时的声速为______m/s． （2）当飞机的飞行速度接近周围的声速时会受到相当大的阻力．上世纪中期，人们就尝试进行超音速飞行．在当时飞机飞行速度有限的情况下，是在高温天气还是在低温天气下进行实验更容易成功？为什么？
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