Question: what is the si unit used to measure the temperature of a substance

title: International System of Units
text: At the close of the 19th century three different systems of units of measure existed for electrical measurements : a CGS - based system for electrostatic units , also known as the Gaussian or ESU system , a CGS - based system for electromechanical units ( EMU ) and an International system based on units defined by the Metre Convention . for electrical distribution systems . Attempts to resolve the electrical units in terms of length , mass , and time using dimensional analysis was beset with difficulties -- the dimensions depended on whether one used the ESU or EMU systems . This anomaly was resolved in 1901 when Giovanni Giorgi published a paper in which he advocated using a fourth base unit alongside the existing three base units . The fourth unit could be chosen to be electric current , voltage , or electrical resistance . Electric current with named unit ' ampere ' was chosen as the base unit , and the other electrical quantities derived from it according to the laws of physics . This became the foundation of the MKS system of units .