Explore the thermalization dynamics of microscopic objects through heat radiation in this 26-minute conference talk from the Workshop on "Blackbody Radiation Induced Effects and Phenomena" at the Erwin Schrödinger International Institute for Mathematics and Physics. Delve into a study examining the thermalization process of a deterministically produced silica fiber with a subwavelength diameter. Learn about the measurement techniques used to determine temperature changes and the ab initio thermodynamic model employed. Discover how the results align with a theoretical model that considers heat radiation as a volumetric effect, taking into account the emitter's shape and size relative to the emission wavelength. Gain insights into the fundamental principles and potential technical applications of modeling thermalization in arbitrarily shaped microscopic objects.