Steam valves hiss because of the steam escaping quickly. When steam is hot and under pressure, it pushes out through a valve like water rushing from a hose. As it leaves, it makes a hissing sound, just like when you let air escape from a balloon.
Examples
- A steam valve on a kettle hisses when the water boils and turns into vapor.
- A car's brake system hisses when it releases hot air from inside the brake caliper.
- A steam engine on a train lets out a loud hiss as pressure is released to power the wheels.
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See also
- What Causes the ‘Pop’ of a Balloon?
- What Causes the ‘Hiss’ of a Hot Shower?
- What Causes the ‘Feel’ of a Soft Pillow?
- How Does Sound Travel Through the Ocean?
- What Causes the ‘Hum’ of a Refrigerator?
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