{"id":63099,"date":"2026-05-06T05:10:43","date_gmt":"2026-05-05T20:10:43","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=63099"},"modified":"2026-05-06T05:10:43","modified_gmt":"2026-05-05T20:10:43","slug":"cut-static-by-90-just-by-changing-your-comb-the-science-of-perfect-hair-and-the-triboelectric-series","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=63099&lang=en","title":{"rendered":"Cut Static by 90% Just by Changing Your Comb: The Science of Perfect Hair and the Triboelectric Series."},"content":{"rendered":"

I\u2019m Ken Kuwako, a science trainer. Every day is an experiment.<\/strong><\/span><\/p>\n

On a cold winter morning, you run a comb through your hair\u2014only to have it puff up and refuse to settle. Ever sighed, \u201cStatic again\u201d? That everyday annoyance actually has a lot to do with the material of your comb. And interestingly, the answer was already hidden in tools people used back in the Edo period.<\/p>\n

Why plastic combs cause static electricity<\/h3>\n

When you run a plastic comb (like polyethylene) through your hair, static electricity builds up and your hair won\u2019t stay in place. The key lies in something called the triboelectric series<\/b>. This is essentially a ranking of materials based on how easily they gain a positive or negative charge when rubbed together.<\/p>\n

According to this series, human hair tends to become positively charged, while polyethylene tends to become negatively charged<\/b>. So when the two come into contact, electrons transfer easily, leaving your hair positively charged.<\/p>\n

\"\"<\/p>\n

Since strands of hair now carry the same positive charge, they repel each other\u2014because like charges push each other away<\/b>. That\u2019s what makes your hair spread out and go fluffy.<\/p>\n

\"\" <\/p>\n

Edo-period wisdom helped prevent static<\/h3>\n

So how can we reduce static? The answer turns out to be something people have used since the Edo period: natural bristle brushes (such as boar hair)<\/b>.<\/p>\n

Natural bristles sit close to human hair in the triboelectric series. In other words, they have similar charging tendencies, so there\u2019s less electron transfer when they rub together\u2014meaning less static<\/b>. Even without knowing the physics, people in the Edo period discovered through experience that natural brushes were gentler on hair. It\u2019s a fascinating case where traditional wisdom aligns perfectly with modern science.<\/p>\n

A TV experiment shows over 10\u00d7 difference<\/h3>\n

A Japanese TV program, \u201cTokoro-san no Megaten!\u201d (Nippon TV), compared static electricity generated by brushing hair about 20 times with three different types of brushes. Here are the results: <\/p>\n

    \n
  • Natural bristle brush:<\/b> +0.45 kV<\/li>\n
  • Anti-static brush:<\/b> +0.82 kV<\/li>\n
  • Plastic brush:<\/b> +5.28 kV<\/li>\n<\/ul>\n

    \"\"<\/p>\n

    Tokoro-san no Megaten! (Nippon TV)<\/a><\/p>\n

    That\u2019s more than a tenfold difference between natural and plastic brushes. For reference, the familiar \u201czap\u201d of static discharge in air starts at around 3 kV. That means plastic brushes can build up charges close to that threshold\u2014no wonder winter shocks are so common.<\/p>\n

    Static electricity can also damage your hair<\/h3>\n

    Static doesn\u2019t just make your hair look messy. It may also affect its health. The cuticle\u2014the protective outer layer of each strand\u2014can become damaged more easily, leading to dryness and loss of shine<\/b> (the exact mechanism isn\u2019t fully clear to me, so if you know more, I\u2019d love to hear it).<\/p>\n

    Considering how often we brush our hair, the material of your brush is more important than it might seem.<\/p>\n

    Static electricity is often dismissed as just a winter nuisance, but behind it are real physical principles: the triboelectric series, charge repulsion, and electrical discharge. When you start seeing everyday inconveniences through the lens of science, the world becomes a little more interesting.<\/p>\n

    I actually bought a static electricity meter myself and ran some experiments. Here are the results comparing different types of brushes:<\/p>\n

    \u3010\u79d1\u5b66\u76e3\u4fee\u3011\u306a\u305c\u300c\u3064\u3052\u6adb\u300d\u306f\u9759\u96fb\u6c17\u304c\u8d77\u304d\u306b\u304f\u3044\uff1f\u9aea\u3068\u6adb\u306e\u79d1\u5b66\u3092\u5fb9\u5e95\u89e3\u660e\uff01\uff08\u4e00\u6483\u89e3\u660e\u30d0\u30e9\u30a8\u30c6\u30a3 \u3072\u3068\u76ee\u3067\u308f\u304b\u308b!!\uff09<\/a><\/p><\/blockquote>\n