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

June 1, 2025 by rawan239

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 :

1 only

1 and 2 only

2 and 3 only

1, 2 and 3

This question was previously asked in

UPSC CAPF – 2020

Download PDF Attempt Online

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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