Which behavior occurs at the triple point of a substance on a phase diagram when heat is added?

💡 Explanation

When heat is added at the triple point, all three phases (solid, liquid, gas) coexist in equilibrium, and added energy goes into phase transitions, maintaining constant temperature until one phase is depleted, due to latent heat. Therefore temperature remains constant, rather than plasma formation, or pressure/volume changes that ignore the phase equilibrium dynamics.

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