Question

What is a triple point of pure water?

(a) -0.01°C

(b) 0.01°C

(c) 0.1°C

(d) -0.1°C

This question was addressed to me by my college director while I was bunking the class.

Question is from Basic Drying Theory in portion Drying of Food Processing Unit Operations

Answer 1

Right choice is (b) 0.01°C

The explanation: The triple point of pure water is at 0.01°C. The triple point is the condition in which the temperature and pressure of all three phases (gas, liquid and solid) can coexist in equilibrium.