<prompt> Critical temperature for liquid nitrogen is36.5degC-20degC-147degC-242degC  <response>: Critical temperature Tc of substance is the temperature at and above which vapor of that substance cannot be liquefied, no matter how much pressure is applied Note: Below critical temperature a substance can exist as a liquid or gas depending on pressure.Critical temperature of N2 is-146.9degC; that means N2 can b3e liquefied below -146.9degC - So, liquid nitrogen must be stored below -146.9degCRefer: Morgan and Mikhails Clinical Anaesthesiology, 5th edition, pg no 11 -12 