Semen is produced and originates from the seminal vesicle, which is located in the pelvis. The process that results in the discharge of semen is called ejaculation. Semen is also a form of genetic material. In animals, semen has been collected for cryoconservation. Cryoconservation of animal genetic resources is a practice that calls for the collection of genetic material in efforts for conservation of a particular breed.
Luminance is a derived measure, expressed in Candela per square metre (\( cd / m^2 \)). An alias for the unit \( cd / m^2 \) (unofficial, but still commonly used) is Nit. Luminance and illumination (Lux) are related, in the sense that luminance is typically used for light-emitting surfaces and illumination for surfaces that are being lit.
Learn more about measurement units and how to use them with NPL e-Learning. 1  The ampere (A) The ampere is the SI base unit of electrical current. 2  The candela (cd) The candela is the SI base unit of luminous intensity. 3  The kelvin (K) The kelvin is the SI base unit of thermodynamic temperature. The kilogram (kg) The kilogram is the SI base unit of mass. The metre (m) The metre is the SI base unit of length. The mole (mol) The mole is the SI base unit of amount of substance. The second (s) The second is the SI base unit of time.