Liquid nitrogen—LN₂—is nitrogen in a liquid state at low temperature. Liquid nitrogen has a boiling point of about −196 °C. It is produced industrially by fractional distillation of liquid air. It is a colorless, mobile liquid whose viscosity is abou

Carbon dioxide, (CO2), is a colorless and non-flammable gas at normal temperature and pressure. Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air.CO2 Gas Uses