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 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 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?
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Categories: Physics · steam,acoustics,pressure,valve mechanics