热点: SQL Error: select id,classid,ttid,onclick,plnum,totaldown,newspath,filename,userid,username,firsttitle,isgood,ispic,istop,isqf,ismember,isurl,truetime,lastdotime,havehtml,groupid,userfen,titlefont,titleurl,stb,fstb,restb,keyboard,title,ftitle,bigpic,newstime,titlepic,smalltext,diggtop from ***_ecms_news order by rand() limit 4

自然笔记:老式爆米花机

时间:2018-07-28 11:31:33 来源:二小的读书笔记作者:爆米花点击:

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很多人的童年记忆里,都有一种神奇的“粮食放大器”:一碗玉米倒进去,“砰”的一声过后,就变成了一麻袋爆米。这就是老式的“葫芦”爆米机,长相和声响都像一颗炮弹。玉米如何变成爆米?原来,在高温高压的条件下,玉米胚乳中的速汽化,淀粉也变成浆状物,体积随之不断膨胀。当玉米粒的外皮不堪重负,就会瞬间爆裂。普通的锅难以达到这样的高温,而且敞口的锅会让爆米四处飞迸。于是,其貌不扬的“葫芦”应运而生。“葫芦”用生铸成,造型浑圆,锅壁很厚,因此能承受非常大的气压。机盖处有粗壮的螺杆和弯,扣紧后可保无虞。每当“葫芦”出现在村巷口,总能引来孩子们围观。卖爆米老师傅从容地把“炮弹”架在火上,一转锅子、一添柴、一边细听锅里的动静。摇中间有一只气压表,指针随着火势缓缓上升,孩子们则渐渐往后退。大约二三十分钟后,老师傅威武地拎起“炮弹”套进麻袋,一踩住,然后用棍果断撬开顶盖。“砰”,一声惊人的炮响,雾滚滚,整条巷子里都是爆米的香味。

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