The measure of capacitance, which quantifies a system's ability to store electric charge. Its symbol is "F", and it is named after an English scientist known for groundbreaking work in electromagnetism.

Farad

The measure of dose equivalent, which adjusts absorbed radiation dose by the biological effects on tissues. Its symbol is "Sv", and it honors a Swedish physicist in medical physics.

Sievert

A measure of luminous intensity, describing the power of visible light emitted in a particular direction. It has a symbol "cd" and is based on the light emitted by a standard source.

Candela

The unit of electric current, established as the constant that results in a specified force between two parallel conductors. Its symbol is "A", and it is named for a French physicist known for studying electromagnetic forces.

Ampere

The standard measure of mass, defined in terms of the Planck constant to maintain universal consistency. Historically tied to a physical prototype, it is now precisely defined for modern science. Its symbol is "kg", and it honors a French scientist who revolutionized chemistry.

Kilogram

A measure of radioactive activity, representing the decay of a radioactive substance at one event per second. Its symbol is "Bq", and it is named after a French physicist who co-discovered radioactivity.

Becquerel

A measure of electrical conductance, quantifying the ease with which an electric current passes through a material. Its symbol is "S", and it honors a German inventor known for contributions to electrical engineering.

Siemens

A measure of pressure, expressed as force applied uniformly over one square meter. Its symbol is "Pa", and it is named for a French mathematician who studied the behavior of fluids.

Pascal

A measure of electrical resistance, representing the opposition to current flow in a conductor. Its symbol is "Ω", and it is named after a German physicist who formulated a key electrical law.

Ohm

The measure of inductance, describing how much a conductor opposes a change in current flow. Its symbol is "H", and it honors an American physicist known for discoveries in electromagnetism.

Henry