The square metre (international spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the unit...

Other wavelengths of visible light produce fewer lux per watt-per-meter-squared. The luminosity function falls to zero for wavelengths outside the visible...

The candela per square metre (symbol: cd/m2) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the...

List of political and geographic subdivisions by total area Calculated: square of the Planck length = (1.62e-35 m)^2 = 2.6e-70 m^2 Russ Rowlett (September...

people per square meter, the environment may feel cramped but manageable; when numbers reach between eight and ten people per square meter, individuals...

from the Sun is 9126 watts per square meter at the distance of Mercury (0.387 AU); but only 1367 watts per square meter at the distance of Earth (1 AU)—an...

A light meter (or illuminometer) is a device used to measure the amount of light. In photography, an exposure meter is a light meter coupled to either...

through the food chain. Typical units are grams per square meter per year or calories per square meter per year. As with the others, this graph shows producers...

areas were a 1,900-square-meter (20,000 sq ft) rainforest, an 850-square-meter (9,100 sq ft) ocean with a coral reef, a 450-square-meter (4,800 sq ft) mangrove...

Sources estimate a global average of between 164 watts to 340 watts per square meter over a 24-hour day; this figure is estimated by NASA to be about a quarter...