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棉线竟能切割玻璃瓶 乒乓球如何弹得高
用棉线切割坚硬的玻璃瓶,博士团畅谈了古人利用热胀冷缩修建的伟大工程都江堰,都使萌娃们对热胀冷缩有了更深刻的认识。那么冷冻乒乓球和加热的乒乓球,从同一高度同时扔下,哪一个弹跳得更高呢?做实验之前,萌娃们就猜测加热的乒乓球内部的气体会膨胀,导致乒乓球降落速度减慢,而冷冻的乒乓球则会迅速降落,从而反弹得更高。为了给萌娃更直观的感受,博士团现场走上高达5米的升降机,同时将加热和冷冻的气球扔下,结果跟萌娃们预测的一模一样。卢小丰解释到这是因为乒乓球的材料受热膨胀时分子间距会变大,这会导致材料变软,弹性会变差,冷冻正相反,会使乒乓球弹性变好。
作为卫视播出的大型演播室亲子科普节目,《奇幻科学城》坚持将演播室打造成实验室,拒绝生硬的数字和僵化的名词解释,邀请专业内权威的专家,通过趣味实验和生动活泼的语言,创造科学新玩法,打破科学在孩子和家长心中遥远、深奥的既定印象,让科学走进人们的生活。未来《奇幻科学城》也将带领观众继续“探秘大不同”的奇妙科学之旅。
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