Science · 6 pages · 12 min
How a pressure cooker raises the boiling point
A sealed lid lets steam raise the pressure, and the boil climbs with it.
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From the opening
A pressure cooker raises the boiling point by letting steam build a pressure higher than the air outside. Water then has to get hotter before its vapor can push back hard enough to boil. The opening covers why a sealed lid changes the boil, what the valve is holding, and how this reverses the mountain.
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Inside
- Why a sealed lid changes the boil
- What the valve is holding
- How this reverses the mountain
- Why a leak undoes the trick
- Where the idea stops applying
- A distinction worth keeping
Sources
- The vapor-pressure curve of water under pressure
- Papin's steam digester and its regulating valve