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 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

The measure of energy or work, equivalent to applying a one-newton force over a one-meter distance. It has a symbol "J" and is named after an English physicist who studied energy transfer.

Joule

The standard measure of length, defined as the distance light travels in a vacuum during an interval of 1/299,792,458 of a second. Named after a French scientist and mathematician who contributed to the development of the metric system, with the symbol "m".

Metre

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

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 measure of thermodynamic temperature, anchored to the fundamental constant of energy per particle. Its zero point represents the absence of thermal motion. The unit’s symbol is "K", and it is named after a British physicist.

Kelvin

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

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

A measure of temperature, used in daily life and industries, defined as an offset from thermodynamic temperature. It uses a scale based on water's freezing and boiling points, with a symbol "°C".

Celsius