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cover of episode What is silica gel and why shouldn’t you eat it?

What is silica gel and why shouldn’t you eat it?

2025/2/24
logo of podcast Moment of Um

Moment of Um

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Mark Lorch教授
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Rabbit De Niro
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Mark Lorch教授:硅胶,或称二氧化硅,其本质与沙子和玻璃的成分相同。其内部结构布满了数百万个微小的孔隙和通道,形成了巨大的表面积,使其能够高效地吸附水分。这使得硅胶成为一种理想的干燥剂,广泛应用于各种产品包装中,以保持产品干燥。硅胶的吸水性与其巨大的表面积密切相关,即使是少量硅胶,其表面积也相当于几个网球场那么大。水分子会吸附在硅胶的表面,从而达到干燥的目的。此外,硅胶还可以重复使用,在潮湿后可以通过烘烤等方式再次干燥。然而,硅胶并非食物,食用它存在窒息的危险,因此绝对不能食用。 Rabbit De Niro:硅胶并非凝胶状物质,而是由许多微小的透明珠子组成。每个珠子内部都布满了肉眼无法看到的微小孔洞和通道,这使得它看起来像海绵一样。这些微小的孔洞是硅胶吸水能力的关键,它们能够有效地吸收水分,保持产品干燥。正因如此,许多产品,例如玩具、鞋子和电子产品,都会在包装中加入硅胶干燥剂。然而,硅胶包装上明确标注着"请勿食用"的警告,这是因为食用硅胶可能会导致身体不适,甚至可能卡在喉咙里造成窒息。因此,切勿食用硅胶。

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Have you ever gotten a new toy or pair of sneakers and noticed there’s a little white paper packet inside the box filled with tiny clear balls? It’s called silica gel. But what is this stuff? And why are the little packets labeled “Do not eat?” We asked science professor Mark Lorch to help us find the answer.

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