A Complete Collection of 100000 Whys
Fav十万个为什么
为什么硬币边缘有齿纹？
简单的摘要：硬币边缘有齿纹的原因主要是防止剪裁、增强防伪性能以及保护硬币。
1、防止剪裁：硬币边缘的齿纹设计最早由牛顿发明，目的是防止人们剪下硬币的一部分。由于齿纹的存在，任何剪裁行为都会破坏边缘的规则刻痕，从而容易被识别。
2、增强防伪性能：齿纹作为硬币的重要特征，增加了伪造的难度。不同面值和年代的硬币齿纹数量和形状各不相同，这成为识别真伪的重要依据。
3、保护硬币：齿纹的设计可以分散硬币边缘在流通中受到的应力，减少磨损和磕碰，延长硬币的使用寿命。
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