Question

DOES ANY LABORATORY THERMOMETER HAS LIQUID NITROGEN AS THERMOMETRIC LIQUID

Answer 1

Yes, Nitrogen is used in high temperature thermometers where mercury cannot be used. This is because mercury boils at ${356.7}^{\circ }C$and hence cannot be used in such thermometers. A volume of nitrogen is enclosed in a vessel and introduced into the region of high temperature. Depending upon the temperature, expansion of the nitrogen volume takes place. Then applying the gas equation, the temperature is calculated.