Intensity may refer to:

In colloquial use

Strength (disambiguation) Strength may refer to: Personal trait *Physical strength, as in people or animals *Character strengths like those listed in the Values in Action Inventory of Strengths, Values in Action Inventory *The exercise of Self-control, willpower Phys ...

Amplitude The amplitude of a periodic variable is a measure of its change in a single period (such as time or spatial period). The amplitude of a non-periodic signal is its magnitude compared with a reference value. There are various definitions of am ...

* Level (disambiguation) * Magnitude (disambiguation)

In physical sciences

Physics

Intensity (physics) In physics and many other areas of science and engineering the intensity or flux of radiant energy is the Power (physics), power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of th ...

, power per unit area (W/m²) *

Field strength In physics, field strength refers to a value in a vector-valued field (e.g., in volts per meter, V/m, for an electric field ''E''). For example, an electromagnetic field has both electric field strength and magnetic field strength. Field str ...

of electric, magnetic, or electromagnetic fields (V/m, T, etc.) *

Intensity (heat transfer) In the field of heat transfer, intensity of radiation I is a measure of the distribution of radiant heat flux per unit area and solid angle, in a particular direction, defined according to :dq = I\, d\omega\, \cos \theta\, dA where *dA is the in ...

, radiant heat flux per unit area per unit solid angle (W·m⁻²·sr⁻¹) *

Electric current An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface. The moving particles are called charge c ...

, whose value is sometimes called ''current intensity'' in older books

Optics

Radiant intensity In radiometry, radiant intensity is the radiant flux emitted, reflected, transmitted or received, per unit solid angle, and spectral intensity is the radiant intensity per unit frequency or wavelength, depending on whether the spectrum is taken ...

, power per unit solid angle (W/sr) *

Luminous intensity In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the huma ...

, luminous flux per unit solid angle (lm/sr or cd) *

Irradiance In radiometry, irradiance is the radiant flux ''received'' by a ''surface'' per unit area. The SI unit of irradiance is the watt per square metre (symbol W⋅m−2 or W/m2). The CGS unit erg per square centimetre per second (erg⋅cm−2⋅s−1) ...

, power per unit area (W/m²)

Astronomy

Radiance In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiati ...

, power per unit solid angle per unit projected source area (W·sr⁻¹·m⁻²)

Seismology

Mercalli intensity scale The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or ...

, a measure of earthquake impact *

Japan Meteorological Agency seismic intensity scale The Japan Meteorological Agency (JMA) Seismic Intensity Scale (known in Japan as the Shindo seismic scale) is a seismic intensity scale used in Japan to categorize the intensity of local ground shaking caused by earthquakes. The JMA intensit ...

, a measure of earthquake impact *

Peak ground acceleration Peak ground acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. PGA is equal to the amplitude of the largest absolute acceleration recorded on an wikt:accelerogram, accelerogram at a ...

, a measure of earthquake acceleration (g or m/s²)

Acoustics

Sound intensity Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area, also called the sound power density and the sound energy flux density. The SI unit of inte ...

, sound power per unit area

Other uses

* Value intensity in philosophy and ethics *In video luminous emittance, the luminous flux per unit area (lm/m² or lux) *

Energy intensity Energy intensity is a Measurement, measure of the efficient energy use, energy inefficiency of an Economic system, economy. It is calculated as units of energy per unit of GDP (Gross Domestic Product) or some other measure of economic output. Hi ...

, an economic measure of energy consumed per unit of GDP (J/$, etc.) *

Carbon intensity Carbon () is a chemical element; it has symbol C and atomic number 6. It is nonmetallic and tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 electrons. It belongs to grou ...

, any of several measures of release of carbon into the environment *

Floor area ratio Floor area ratio (FAR) is the ratio of a building's total floor area (gross floor area) to the size of the piece of land upon which it is built. It is often used as one of the regulations in city planning along with the building-to-land ratio. Th ...

, the ratio of the total floor area of buildings on a certain location to the size of the land of that location, or the zoning limit imposed on such a ratio * Intensity (measure theory), the average value a measure assigns to an interval of length one *

Exercise intensity Exercise intensity refers to how much energy is expended when exercise, exercising. Perceived intensity varies with each person. It has been found that intensity has an effect on what fuel the body uses and what kind of adaptations the body mak ...

, a measure of how much work is done during exercise (% of max heart rate) * ''Intensity'' (novel), a 1995 novel by Dean Koontz ** ''Intensity'' (film), a 1997 made-for-TV movie based on the novel * ''Intensity'' (Charles Earland album), 1972 * ''Intensity'' (Art Pepper album), 1960 * ''Intensity'' (John Klemmer album), 1973 *''

Intensity! ''Intensity!'' is the second studio album released by Croatian surf music, surf rock band The Bambi Molesters. The album was recorded in December 1998 and was released in 1999. Background In 1999, the band signed to Dancing Bear, Dancing Bear Rec ...

'', a 1999 album by The Bambi Molesters * ''Intensity'' (video game), a 1988 video game. *"Intensity", a song by Linda Perhacs from the album '' The Soul of All Natural Things''