Question

Triple point of water is:

• A. $373.16\mathrm{K}$
• B. $373.160\mathrm{F}$
• C. $273.16\mathrm{K}$
• D. $273.160\mathrm{F}$

Answer 1

Answer: (B), (C)

$273.16\mathrm{K}$

Explanation for correct option

(C) $273.16\mathrm{K}$

Triple point

• The temperature and pressure where a substance can stably exist in its three forms of liquid, solid, and gas is known as the Triple point.

Triple point of water

• The temperature at which saturated vapor, pure ice, and melting ice are all in equilibrium is known as the triple point of water.
• The triple point of water is $273.16\mathrm{K}$.
• The triple point of water is the standard fixed-point temperature for thermometer calibration.
• According to this agreement, the size of the kelvin is defined as being equal to $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$273.16$}\right.$ of the difference between the water's triple point and absolute zero.

Explanation for incorrect options

• The triple point of water is $273.16\mathrm{K}$.
• Hence all other options (A), (B) and (D) are incorrect.

Therefore, the correct option is (C) $273.16\mathrm{K}$.