In particular, in extant works attributed to Archimedes, the moment is pointed out in phrasings like: The context of these works is mechanics and geometry involving the lever. "inclination") and composites like ἰσόρροπα ( isorropa, lit. In works believed to stem from Ancient Greece, the concept of a moment is alluded to by the word ῥοπή ( rhopḗ, lit. This technique applies to small objects such as molecules, īut has also been applied to the universe itself, being for example the technique employed by the WMAP and Planck experiments to analyze the cosmic microwave background radiation. Measurements pertaining to multipole moments may be taken and used to infer properties of the underlying distribution. (such as force or electrical charge) at that point: In its most basic form, a moment is the product of the distance to a point, raised to a power, and a physical quantity Commonly used quantities include forces, masses, and electric charge distributions. In principle, any physical quantity can be multiplied by a distance to produce a moment. For example, the moment of force, often called torque, is the product of a force on an object and the distance from the reference point to the object. In this way, the moment accounts for the quantity's location or arrangement. Moments are usually defined with respect to a fixed reference point and refer to physical quantities located some distance from the reference point. In physics, a moment is a mathematical expression involving the product of a distance and physical quantity.
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