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# 實驗：密度與浮沉 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about ' 實驗：密度與浮沉' - landen

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Presentation Transcript

• 是鐵重些還是木重些呢?

A. 鐵比木重

B. 木比鐵重

C. 一樣重

• 事實上，這樣比較是沒有意思的；相同體積的固體／液體，其質量不一定相同
• 要比較不同物體的輕重，必須先考慮這些物體在相同體積下的重量，即比較密度

• 是甚麼因素影響／決定一種物質浮和沉在另一種物質中？

• 因為餃子或肉丸中含有微量的空氣。當剛投入水中時，餃子或肉丸密度比水大，就沉入鍋底。當加熱至煮熟後，內部的氣體和肉質都同時膨脹，整個餃子或肉丸體積增大了，也就使密度比水小，於是便浮起來。

（立方厘米）

（克/立方厘米）

1) 石頭是 ….. 浮 / 沉 ?

2) 木頭是 ….. 浮 / 沉 ?