Your refrigerator makes a hum because it has a special motor inside that turns on and off to keep your food cold. When the motor is running, it vibrates, like when you shake a drum, which creates sound. That’s why you hear that low hum all the time.
Examples
- Your refrigerator hums like a cat purring when it's working hard to keep your milk cold.
- You can hear the hum from across the room, especially on quiet nights.
- The hum is louder when you open the fridge door and take out all the food.
Ask a question
See also
- What Causes the Northern Lights?
- How Does a Mirror Work Exactly?
- How Does Gravity Affect the Moon’s Orbit?
- What Causes a ‘Golden’ Sunset or Sunrise?
- How Does Gravity Affect Space Travel?
Discussion
Recent activity
Categories: Physics · sound,vibration,refrigeration,acoustics