Temperature & Scales of Temperature
Learn how temperature is measured, understood, and compared across different scales.
Triple Point of Water
The triple point of water is a unique condition where solid, liquid, and vapor phases of water coexist in thermal equilibrium at a specific temperature and pressure.
Key Facts
- Temperature = 273.16 K (0.01 °C)
- Pressure = 611.657 Pa
- All three states (ice, water, vapor) exist simultaneously.
- It is used to define the Kelvin temperature scale.
Triple Point of Water = 273.16 K at 611.657 Pa
Importance
The triple point is chosen by scientists as the standard fixed point to define temperature scales. The difference between the Triple Point temperature and absolute zero defines the Kelvin scale.
Phase Diagram (Triple Point)
This diagram shows the solid, liquid, and vapor regions of water, with the triple point marked clearly.
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