What does the triple point on the phase diagram of water represent?

Answer 1

The conditions of temperature and pressure when ALL three phases of water are in equilibrium.

This is an empirical phenomenon that undoubtedly represents peculiar, non-standard conditions; the solid-liquid phase boundary of the water phase diagram has a negative slope, which makes it extremely unusual. This is explained in more detail here.

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Answer 2

Naomi Aronson

The special combination of temperature and pressure at which water can simultaneously exist in equilibrium as a solid, liquid, and gas is represented by the triple point on the phase diagram of water.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.