What are tubes?

Tubes are long, hollow containers that help things move from one place to another.

Imagine you have a big straw, like the ones you drink juice from. If you put some marbles inside it and shake it, the marbles will roll down to the other end. That’s kind of how tubes work! They can carry liquids, solids, or even air.

Think about your socks. When you slide your foot into a sock, it stretches around your foot, that's like how some tubes stretch and fit around things. If you have two socks connected together, they make a long tube that can hold more marbles or even water!

Tubes are used in many places, inside your body (like when food goes from your mouth to your stomach), in the kitchen (like the ones that carry water to the sink), and even in big machines. They're like invisible roads for things to travel on, without needing wheels or legs!