Question

Liquid nitrogen is used as a commercial refrigerant to flash freeze foods. Nitrogen boils at $-{196}^0\mathrm{C}$. What is this temperature on the Kelvin scale?

Answer 1

• Liquid nitrogen is a liquid at a low temperature.
• Liquid nitrogen has a boiling point of$-{196}^0\mathrm{C}$.
• It is produced by fractional distillation of liquid air on an industrial scale.
• It is a colourless, low viscosity liquid.
• It is widely used as a coolant.
• The temperature of liquid nitrogen on the Kelvin scale is

$$\begin{gathered} \mathrm{K}={}^0\mathrm{C}+273 \\ =-196+273 \\ =77\mathrm{K} \end{gathered}$$