How do workers get fresh air in a long tunnel?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. How do workers get fresh air in a long tunnel?

The Big Idea

Digging a tunnel makes dust and engine fumes. Workers need clean air to breathe. So builders keep fresh air moving all the time!

Big Fans

Step one: Big Fans. Huge fans push clean air through big tubes or duct pipes to the working end. Fresh air reaches the workers.

Air Shafts

Step two: Air Shafts. Shafts, which are vertical holes to the surface, let stale air out. Air keeps moving through.

Air Checks

Step three: Air Checks. Sensors check the air for dust and harmful gases. Good ventilation keeps workers healthy and safe.

A Closer Look

Let's take a closer look! Fans push air. Duct pipes carry it. Shafts let stale air out. Sensors check it.

Quick Facts

Quick facts! Long road tunnels also have big fans in their ceilings. Workers may wear masks to protect their lungs from dust. Tunnel air is kept moving all day and night. Moving air also helps keep workers cool.

Think Like a Scientist

Now, think like a scientist! Make a tunnel from a long paper tube. With a grown-up, use a hair dryer on the cool setting at one end. Hold a tissue near the other end. Watch the moving air push the tissue. How is this like a tunnel fan?

Outro

Workers get fresh air in long tunnels from huge fans that push clean air through duct pipes, shafts that let stale air out, and sensors that check for dust and harmful gases. Science is amazing! The world under your feet is full of surprises. Keep digging into big questions, and keep exploring with me! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!