為什麼我的 25 磅混凝土板啞鈴比我的 30 磅金屬啞鈴重？

儘管重量相同，但混凝土板啞鈴的密度遠低於金屬啞鈴。這表示混凝土板啞鈴的體積較大，因此在空氣中會產生更大的浮力。浮力會抵消一部分重力，使混凝土板啞鈴的實際重量減輕。此外，金屬啞鈴通常有中空設計，而混凝土板啞鈴通常是實心的，這也進一步加劇了重量差異。

常見問題

1. 不同密度的物質會如何影響重量？

不同密度的物質在相同體積下重量不同，密度較高的物質較重。

2. 浮力的作用是什麼？

浮力是作用在流體中的物體上的向上的力，與物體排開流體的重量相等。

3. 中空設計如何影響啞鈴的重量？

中空設計會減輕啞鈴的重量，因為它減少了啞鈴的體積和質量。

4. 啞鈴的形狀會影響其重量嗎？

是的，非對稱形狀的啞鈴可能會產生不同的浮力，從而影響其實際重量。

5. 在水中稱重啞鈴和在空氣中稱重有什麼區別？

由於浮力，在水中稱重的啞鈴會比在空氣中稱重輕。

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