为什么热水和冷水倒出来的声音不一样?

克里斯:如果你注意到，当你早上打开淋浴器时，冷水先从水管里流出来，它会溅起水花，在淋浴器底部发出不同的声音，而热水则紧随其后流入;钞票会变的。这是一个真实的观察;你的耳朵没有欺骗你。原因是水会根据温度改变它的粘度。如果你用一个非常强大的显微镜放大观察一些水分子，你会看到它们的形状就像微型回旋镖。在回飞镖的顶端，你会看到一个氧原子，在每个臂上，你会看到氢原子。氧喜欢电子，所以它把自己和氢的电子紧紧地拉向自己，这使得氧有点负电荷。因此氢相应带一点正电。因此，当水分子在溶液中并排坐在一起时，带正电的氢被相邻分子中带负电的氧吸引，这被称为氢键。 It makes water sticky, and it gives it some of its special properties that in fact help it to make life happen on Earth. So it's pretty important that this happens. But, when you heat the water up, the particles start to move much more quickly. They have more kinetic energy which is a function of the temperature. This means that they're zipping past each other much faster. They're therefore gluing onto each other less well and this makes the water runnier or less viscous. So when it comes splashing out of the shower and hits the shower pan, the water fragments into smaller particles and makes a higher pitched splashing noise than when it goes into the cup or goes into the sink when it's cold. Have a listen next time you're in the bath for the shower and you will see that the note is different.