Multiple choice

In which of the following conditions do the three states of water co-exist in equilibrium?

  1. At the average of boiling point and melting point, where the water will be in a co-existing state.

  2. At thunderstorm point, where the storm causes the water to crystallise at higher places and evaporate at lower altitudes.

  3. At triple point at which water is at 0.01oC and 611.3 Pa.

  4. Water, ice and vapors cannot co-exist as there is a huge difference between boiling and melting point of water.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

At temperatures as low as 0.010C and very low pressure 611.3 Pa, i.e. 1/600 of sea level pressure, water exists in all its three forms in equilibrium. This is known as the triple point of water.

Keep practicing — related questions