doi:10.1119/1.5018696engRamos Silva, ManuelaMartín Ramos, PabloPereira da Silva, PedroStudying cooling curves with a smartphoneART-2018-106906This paper describes a simple procedure for the study of the cooling of a spherical body, using a standard thermometer and a smartphone. For a more thorough analysis of the data, a computer can also be used. Experiments making use of smartphone sensors have been described before, contributing to an improved teaching of Classical Mechanics1-11, but rarely expand to Thermodynamics12-14. In this experiment, instead of using a smartphone camera to slow down a fast movement, we are using the device to speed up a slow process. For that we propose the use of FrameLapse free app15 to take periodic pictures (in the form of a time-lapse video) and then of VidAnalysis Free app16 to track the position of the mercury inside the thermometer, thus effortlessly monitoring the temperature of a cooling body2018http://zaguan.unizar.es/record/7118610.1119/1.5018696http://zaguan.unizar.es/record/71186oai:zaguan.unizar.es:71186info:eu-repo/grantAgreement/ES/DGA/UID/FIS/04564-2016PHYSICS TEACHER 56 (2018), 53-55by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess