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  • 探索科學的奧秘實驗作文400字

      正在奇奧的科學世界里,我們能夠從中學到很多的事理,還能夠從中獲得很多的樂趣,今天我就加入了一次嘗試。

       林教員拿著一個塑料瓶和一杯溫水走進教室。我們大師都獵奇地閉大眼睛。林教員笑著說:“今天,我們要做一個風趣的科學嘗試。”同窗們聽了,都眾說紛紜,不曉得林教員葫蘆里賣的什么藥。林教員又接著說:“誰能夠不消手就讓這個塑料瓶扁下去。”我們都回覆不出來,林教員就把瓶蓋打開,把那一杯溫水倒進塑料瓶里,我們都說這不是科學嘗試。過了好一會兒,林教員又把塑料瓶里的水倒掉,敏捷把瓶蓋擰緊,瓶子慢慢地扁了進去。

       為了證明嘗試有沒有科學道理,林教員把我們分成了四組,每一組都有一個塑料瓶和一杯溫水,我們組吧水倒進了塑料瓶里,我們把里面的溫水給倒掉,然后把瓶蓋給擰緊。我們都閉大了獵奇的眼睛,期待著奇不雅的呈現。過了好一會兒,塑料瓶正正在一點一點地變瘦,還不時發出“啪啪”的聲音。最初,塑料瓶變得很瘦很瘦,就像一個養分不良的瘦娃娃。

       林教員說:“你們來試一試把塑料瓶變歸去。” 我們都很興奮,我們組把這個變瘦的塑料瓶放正在有溫水的臉盆里,我帶著獵奇的表情去察看塑料瓶。啊!塑料瓶竟然正在慢慢地縮大,登時,我們都顯露了驚訝的臉色。

       后來,我們大師一路查找了材料,才曉得熱縮冷縮的道理:由于把溫水倒進塑料瓶里,瓶子里的空氣壓力很低,外面的空氣壓力很大,就會使塑料瓶縮進去。相反,水里溫度高,瓶子外面的壓力很小,里面的壓力很大,就會使塑料瓶縮大。

       通過這一次的科學嘗試,我不只學到了科學的道理,還悟出了一個事理:糊口中的每一樣天然現象,都有它本人的道理只需外面細心察看,就能夠從中發覺此中個奧妙。

      
    (教師考語:小做者愛察看、愛摸索,把科學嘗試過程寫得活潑具體。 )

    未經允許不得轉載:小學生作文網 » 探索科學的奧秘實驗作文400字

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