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Strength

Amplitude

Level

Intensity (physics), power per unit area (W/m²)

Field strength of electric, magnetic, or electromagnetic fields.

Radiant intensity, power per unit solid angle (W/sr)

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

Irradiance, power per unit area (W/m²)

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

Mercalli Intensity, a measure of earthquake impact

Japan Meteorological Agency seismic intensity, a measure of earthquake impact

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

In video, intensity means luminous emittance, luminous flux per unit area (lm/m² or lux)

Exercise intensity is a measure of how much work is done during exercise (% of max heart rate)

Intensity (novel), a novel by Dean Koontz

Intensity (TV movie), a 1997 made for TV movie based on the novel

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Sound intensity

Brightness