Thaned PruttivarasinMahidol UniversityMinistry of Education2020-06-022020-06-022020-05-01European Journal of Physics. Vol.41, No.3 (2020)13616404014308072-s2.0-85084405373https://repository.li.mahidol.ac.th/handle/20.500.14594/56345© 2020 European Physical Society. We present a simple experiment to determine absolute zero temperature by measuring the Johnson noise of a thermistor. Using the thermistor itself as a temperature sensor, we measure the thermistor voltage noise at different temperatures by submerging the thermistor in hot and cold water contained in a thermally insulated cup. A linear fit of the data yields an absolute zero temperature of -274 ± 14 °C, agreeing with the accepted value. The experiment is simple enough to be performed at most universities as a part of an undergraduate experimental physics course.Mahidol UniversityPhysics and AstronomyArticleSCOPUS10.1088/1361-6404/ab6c29