Question

Water exists both as solid and liquid at:

• A. ${100}^{o}C$
• B. $-{50}^{o}C$
• C. ${2.5}^{o}C$
• D. $0^{o}C$

Answer 1

Answer: (D)

$0^{o}C$

Zero degree Celsius is also known as the triple point of water. At this temperature water is in the process of changing from a solid state into the liquid phase or vice versa. Molecules in the liquid phase can lose a bit of energy and solidify whilst solid water (ice) can gain some energy and melt.So both the liquid and solid state exist at 0-degree Celsius.