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.
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See also
- What Causes the ‘Hum’ in a Refrigerator?
- What Causes the ‘Sound’ of a Bell and How Is It Different From a Drum?
- What Causes the ‘Hum’ of a Fan?
- How Does Sound Travel Through the Ocean?
- What Causes the ‘Rustle’ of a Blanket?
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