In circuit science, the ability of a capacitor to store charge at a certain potential difference (1U) is called capacitance, denoted as C. Adopting the International System of Units, the unit of capacitance is Farad, abbreviated as Fa; Marked as F. The symbol for capacitor is C. C=ε S/d=ε S/4 π kd (vacuum)=Q/U In the International System of Units, the unit of capacitance is Farad, abbreviated as F, with the symbol F. Due to the large size of Farad, commonly used capacitance units include millifarads (mF), microfarads (μ F), nanofarads (nF), and picofarads (pF). The conversion relationship is: 1 Farad (F)=1000 millifarads (mF)=1000000 microfarads (μ F) 1 microfarad (μ F)=1000 nanofarads (nF)=1000000 picofarads (pF).