Have you ever looked up at the sky and seen fluffy white clouds floating by, light as a feather? Well, here’s the surprising part—those clouds are actually really heavy! In fact, some of them can weigh more than a fully loaded aeroplane. The idea of cloud weight sounds strange at first, but it’s real science, and it’s all to do with the mass of clouds and how water behaves in the atmosphere.

In this lesson, we’re going to explore exactly what gives clouds their weight, how scientists measure it, and what it tells us about the weather. Along the way, you’ll learn about water droplets, air pressure, and even why clouds don’t fall out of the sky. So, if you’ve ever wondered, “How heavy are clouds?” — you’re about to find out.