Why Do Refrigerators Hum?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why do refrigerators hum?

The Big Idea

Refrigerators hum because a motor inside them shakes! The shaking spreads into the fridge's walls, and the walls push on the air. Because the shaking repeats the same way again and again, the hum is steady.

A Motor Works

Step one: a motor works. A refrigerator has a part called a compressor that squeezes a cooling gas. Its motor and moving parts vibrate as they run, a bit like a tiny buzzing engine.

Walls Shake

Step two: the walls shake. The vibration passes into the fridge's metal body and panels. Big flat walls are great at moving air, just like a speaker.

A Steady Hum

Step three: a steady hum. The shaking repeats the same way over and over, so the pitch stays the same. A steady, repeating vibration gives a hum instead of a random noise.

A Closer Look

Let's take a closer look! The compressor motor starts up. Its parts shake back and forth. The fridge walls shake along. And you hear a calm, steady hum.

Quick Facts

Quick facts! Many appliances hum because they have parts that shake. Electricity in a wall socket wiggles back and forth 60 times each second in Canada, and that can shape some hums. Hums are often a little more than 100 hertz, which is a low sound. When a fridge hum changes, it just means the motor is working differently.

Think Like a Scientist

Now, lab challenge! Turn off the TV and listen quietly in your kitchen for one minute. Write down all the humming and buzzing sounds you hear. Which ones come from vibrating machines? Share what you discover with a grown-up.

Outro

A humming fridge is a steady, repeating shake. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!