noun ダウンロード 🔗共有 光子 The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson. Examples : "Sunlight is made of tiny particles called photons. " 太陽光は光子と呼ばれる小さな粒子でできています。 physics energy astronomy element phenomena AIとチャット語彙ゲーム読解練習