今天我跟同学们说说化学与衣食住行的“行”。我们几乎每天少不了上路,许多路面是沥青铺成的。沥青是什么?化学告诉我们,沥青是组成非常复杂多样的混合物。沥青呈黑色,是由于它含单质碳和多种多样的碳氢化合物。沥青黏稠,似液似固,又非液非固,实在是由于它是豆腐、乳酪、琼脂、蜡之类的“凝胶”。 Today I talk to my classmates about chemistry, food, clothing and shelter. We can hardly afford to go on the road everyday, and many pavements are asphalt-paved. What is bitumen? Chemistry tells us that bitumen is a very complex and diverse mixture. Bitumen is black because of its simple carbon and its wide range of hydrocarbons. Asphalt sticky, like liquid-like solid, non-liquid non-solid, it is because it is tofu, cheese, agar, wax and the like “gel ”.