Amount of substance is a measure of the number of entities (atoms, molecules, ions) in a sample, expressed in moles.

Electric current is the flow of electric charge through a conductor, measured in amperes (A). It is essential for powering electrical devices.

Length is a measurement of distance between two points, while wavelength is the distance between corresponding points on a wave.

Luminous intensity is the measure of the amount of light emitted in a specific direction, measured in candelas.

Mass is a measure of the amount of matter in an object. It is a fundamental property that determines an object's inertia and gravitational attraction.

Plane angle measures rotation between two intersecting lines, often in degrees or radians.

Solid angle is a measure of the extent of a cone-shaped region in space, representing the amount of 3D space an object subtends.

Temperature is a measure of the average kinetic energy of particles in a substance, determining its hotness or coldness.

Time is a fundamental physical quantity measuring the duration of events. Half-life is the time taken for a substance to decay by half. Labour refers to the physical and mental effort exerted in the production of goods and services.

Unitless is a physical quantity that does not have any specific unit of measurement, typically used for ratios, angles, and pure numbers.