1) Unit of temperature in the International System of Units (Sl) equal to the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. The kelvin temperature scale uses Celsius degrees with the scale shifted by 273.16. Therefore, 0 K is at absolute zero. Add 273.16 to any Celsius value to obtain the corresponding value in kelvins. 2) A technique using 4 terminals to isolate current carrying leads from voltage measuring leads.