Intensity may refer to:

In colloquial use

Strength (disambiguation) Strength may refer to: Physical strength *Physical strength, as in people or animals *Hysterical strength, extreme strength occurring when people are in life-and-death situations *Superhuman strength, great physical strength far above human ca ...

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 amplit ...

* Level (disambiguation) * Magnitude (disambiguation)

In physical sciences

Physics

Intensity (physics) In physics, 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 the energy. In the SI system, it has units watts ...

, power per unit area (W/m²) *

Field strength In physics, field strength means the ''magnitude'' of a vector-valued field (e.g., in volts per meter, V/m, for an electric field ''E''). For example, an electromagnetic field results in both electric field strength and magnetic field strength. As ...

of electric, magnetic, or electromagnetic fields (V/m, T, etc.) * Intensity (heat transfer), radiant heat flux per unit area per unit solid angle (W·m⁻²·sr⁻¹) *

Electric current An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. The moving pa ...

, 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 human eye. ...

, 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 (W⋅m−2). The CGS unit erg per square centimetre per second (erg⋅cm−2⋅s−1) is often used ...

, 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 radiatio ...

, 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), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the eff ...

, 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 intensi ...

, 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. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m2 ...

, sound power per unit area

Other uses

Value intensity In ethics and social sciences, value denotes the degree of importance of something or action, with the aim of determining which actions are best to do or what way is best to live (normative ethics in ethics), or to describe the significance of di ...

in philosophy and ethics *In video

luminous emittance In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness ...

, the luminous flux per unit area (lm/m² or lux) *

Energy intensity Energy intensity is a measure of the energy inefficiency of an economy. It is calculated as units of energy per unit of GDP. * High energy intensities indicate a high price or cost of converting energy into GDP. * Low energy intensity indicate ...

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

Carbon intensity An emission intensity (also carbon intensity or C.I.) is the emission rate of a given pollutant relative to the intensity of a specific activity, or an industrial production process; for example grams of carbon dioxide released per megajoule ...

, 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. The ...

, 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) In the mathematical discipline of measure theory, the intensity of a measure is the average value the measure assigns to an interval of length one. Definition Let \mu be a measure on the real numbers. Then the intensity \overline \mu of ...

, the average value a measure assigns to an interval of length one *

Exercise intensity Exercise intensity refers to how much energy is expended when 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 makes after exe ...

, 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 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 Records. The release of the ...

'', 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 ''The Soul of All Natural Things'' is the second studio album by American singer Linda Perhacs, released by Asthmatic Kitty Records in 2014. Produced by Chris Price and Fernando Perdomo, the album was released 44 years after her debut album ''Pa ...