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AM1. The spectrum after travelling through the atmosphere to sea level with the sun directly overhead is referred to, by definition, as "AM1". This means "one atmosphere". AM1 ( =0°) to AM1.1 ( =25°) is a useful range for estimating performance of solar cells in equatorial and tropical regions. AM1.5.
An ampere-hour or amp-hour (symbol: A⋅h or A h; often simplified as Ah) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs. [ 1][ 2] The commonly seen milliampere-hour (symbol: mA⋅h, mA h, often ...
Labor is supply, money is demand. A man-hour or human-hour is the amount of work performed by the average worker in one hour. [1] [2] It is used for estimation of the total amount of uninterrupted labor required to perform a task. For example, researching and writing a college paper might require eighty man-hours, while preparing a family ...
Immigrant generations. In sociology, people who permanently resettle to a new country are considered immigrants, regardless of the legal status of their citizenship or residency. [1] The United States Census Bureau (USCB) uses the term " generational status " to refer to the place of birth of an individual or an individual's parents. First ...
Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each ...
Less-than sign. The less-than sign is a mathematical symbol that denotes an inequality between two values. The widely adopted form of two equal-length strokes connecting in an acute angle at the left, <, has been found in documents dated as far back as the 1560s. In mathematical writing, the less-than sign is typically placed between two values ...
Hour angle. The hour angle is indicated by an orange arrow on the celestial equator plane. The arrow ends at the hour circle of an orange dot indicating the apparent place of an astronomical object on the celestial sphere. In astronomy and celestial navigation, the hour angle is the dihedral angle between the meridian plane (containing Earth's ...
One half. One half is the irreducible fraction resulting from dividing one ( 1) by two ( 2 ), or the fraction resulting from dividing any number by its double. It often appears in mathematical equations, recipes, measurements, etc. Previous Main Fraction. 0.375.