At triple point the substance co-exists in 1. Liquid phase 2. Solid

At triple point the substance co-exists in

  • 1. Liquid phase
  • 2. Solid phase
  • 3. Vapour phase

Select the correct answer using the code given below :

[amp_mcq option1=”1 only” option2=”1 and 2 only” option3=”2 and 3 only” option4=”1, 2 and 3″ correct=”option4″]

This question was previously asked in
UPSC CAPF – 2020
At the triple point of a substance, the solid, liquid, and vapour (gaseous) phases of that substance coexist in thermodynamic equilibrium.
The triple point is a unique specific temperature and pressure for a substance, distinct from the melting point (solid-liquid equilibrium) or boiling point (liquid-vapour equilibrium) which vary with pressure.
For water, the triple point is at 0.01°C (273.16 K) and 611.657 pascals (about 0.006 atm). This specific point is used to define the Kelvin temperature scale.
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