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# What maximum fraction of the air in the room is displaced by the gaseous nitrogen?

Last updated date: 25th Jul 2024
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Hint: Liquid nitrogen, or LN₂, is nitrogen in a liquid state at low temperatures (boiling point at sea level: $195.79{\text{ }}^\circ C{\text{ }}\left( {77{\text{ }}K;{\text{ }}320{\text{ }}^\circ F} \right)$. The boiling point of liquid nitrogen is about $- 195.8^\circ C$. It's made in a factory by fractional distillation of liquid air. It's a clear, low-viscosity liquid that's often used as a coolant.
After liquefaction, the diatomic character of the $N_2$ molecule is preserved. Because of the weak van der Waals interaction between $N_2$ molecules, no interatomic interaction occurs, resulting in a very low boiling point.

Liquid nitrogen, or $LN_2$, is nitrogen in a liquid state at low temperatures (boiling point at sea level: $195.79{\text{ }}^\circ C{\text{ }}\left( {77{\text{ }}K;{\text{ }}320{\text{ }}^\circ F} \right)$. The boiling point of liquid nitrogen is about $- 195.8^\circ C$. It's made in a factory by fractional distillation liquid air. It's a clear, low-viscosity liquid that's often used as a coolant. After liquefaction, the diatomic character of the N₂ molecule is preserved. Because of the weak van der Waals interaction between N₂ molecules, no interatomic interaction occurs, resulting in a very low boiling point.
Using the density formula $D = \dfrac{m}{v}$, calculate the mass of liquid N₂ present using density and volume parameters. At room temperature, all of this would be present as a vapour.
Convert from $m^3$ to L ($1m^3= 1000L$) and find the volume of the space using V= l x b x h.
Metal mirror (slam) freezing involves cooling a polished metal surface to $-190^\circ C{\text{ }}to{\text{ }}-196^\circ C$ with liquid nitrogen, and bringing the specimen into contact with the metal surface and holding it there before cryofixation is complete.