科学魔法!手放进水中秒结冰 网友赞:长知识
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▲NurdRage将手放进水溶液中,溶液就瞬间结冰。(图/翻摄自影片)
国际中心/综合报导
国外网友NurdRage经常在网路上分享科普知识,最近他又上传一支影片,影片里他将手缓缓放进水中,本来透明的水瞬间结冰,引起大量网友好奇观看,10天内就吸引了164万人次点阅。
影片中这瓶水会迅速结冰,是因为NurdRage准备的不是普通的水,他预先制作了1瓶过饱和的醋酸钠溶液,然后再将沾满醋酸钠颗粒的手,泡在已制成的溶液中,就会产生过饱和醋酸钠溶液迅速结晶的热冰现象。
原理是醋酸钠在水中的溶解度会随着温度增加而增加,在高温时制备的饱和溶液,在温度下降后尚未呈现结晶沉淀时,称为过饱和溶液状态。如果持续静置,就会因溶解度降低而有醋酸钠的结晶沉淀。这项实验是在醋酸钠溶液还没有结晶时进行操作,让过饱和溶液碰到醋酸钠颗粒(称为晶种)或给予接触,可以触发处于不稳定状态的过饱和醋酸钠溶液迅速结晶。
这支影片10天内就吸引了164万人次点阅,让网友直呼「太酷了」、「长知识了」,还有网友搞笑的说「原来青稚是这样把水结冰」。不过知道原理的网友呼吁,进行这样的实验要小心,因为实现过程中会放出热能,要避免被烫伤。
▼影片取自YouTube,如遭删除请见谅。
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