The conversion from microvolt to millivolt represents a change in the unit of measurement for small electrical potentials. Microvolts (μV) and millivolts (mV) are both used to express voltage in the International System of Units (SI). A millivolt is equal to one-thousandth of a volt, and a microvolt is one-millionth of a volt. This conversion is essential in various scientific and practical applications, including electronics, electrical engineering, and medical devices. For instance, in medical equipment, millivolts are used to measure the electrical activity of the heart, while microvolts are used in sensitive electronic circuits to detect and amplify weak signals.