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However, this calibration is done at the factory.
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When the scale is moved to another location on Earth, the force of gravity will be different, causing a slight error. So to be highly accurate, and legal for commerce, spring scales must be re-calibrated at the location at which they will be used. A balance on the other hand, compares the weight of an unknown object in one scale pan to the weight of standard masses in the other, using a lever mechanism — a lever-balance.
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The standard masses are often referred to, non-technically, as "weights". Since any variations in gravity will act equally on the unknown and the known weights, a lever-balance will indicate the same value at any location on Earth. Therefore, balance "weights" are usually calibrated and marked in mass units, so the lever-balance measures mass by comparing the Earth's attraction on the unknown object and standard masses in the scale pans. In the absence of a gravitational field, away from planetary bodies e.
Some balances can be marked in weight units, but since the weights are calibrated at the factory for standard gravity, the balance will measure standard weight, i. If the actual force of gravity on the object is needed, this can be calculated by multiplying the mass measured by the balance by the acceleration due to gravity — either standard gravity for everyday work or the precise local gravity for precision work.
Tables of the gravitational acceleration at different locations can be found on the web.
Gross weight is a term that is generally found in commerce or trade applications, and refers to the total weight of a product and its packaging. Conversely, net weight refers to the weight of the product alone, discounting the weight of its container or packaging; and tare weight is the weight of the packaging alone.
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The table below shows comparative gravitational accelerations at the surface of the Sun, the Earth's moon, each of the planets in the solar system. For the Sun, the surface is taken to mean the photosphere. The values in the table have not been de-rated for the centrifugal effect of planet rotation and cloud-top wind speeds for the gas giants and therefore, generally speaking, are similar to the actual gravity that would be experienced near the poles.
From Wikipedia, the free encyclopedia. This page is about the physical concept. In law, commerce, and in colloquial usage weight may also refer to mass. For other uses see weight disambiguation.
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The force on a mass due to gravity. A spring scale measures the weight of an object. Measuring weight versus mass. A spring scale measures weight, by seeing how much the object pushes on a spring inside the device. On the Moon, an object would give a lower reading.
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A balance scale indirectly measures mass, by comparing an object to references. On the Moon, an object would give the same reading, because the object and references would both become lighter. For other uses, see Weigh disambiguation. Earth's gravity and Surface gravity. International Journal of Science Education. In Richard Alan Strehlow. Standardization of Technical Terminology: Principles and Practice — second volume. Physics for Scientists and Engineers: University Physics with Modern Physics. Physics for Scientists and Engineers with Modern Physics. In commercial and everyday use, the term "weight" nearly always means mass.
In science and technology "weight" has primarily meant a force due to gravity. In scientific and technical work, the term "weight" should be replaced by the term "mass" or "force", depending on the application. American Journal of Physics. Note 3 to Section 1. Taylor; Ambler Thompson, eds. Principles of mechanics and biomechanics. Taylor March 3, [July 2, ]. Comments on Some Quantities and Their Units".
Handbook of Chemistry and Physics 44th ed. Chemical Rubber Publishing Co. Physical and Mathematical Tables. The Great Molasses Flood still seems like a tragedy that could have been averted, but the disaster really drew attention to the potential repercussions of shaky construction.
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The case helped prompt Massachusetts and many other states to pass laws requiring that engineers and architects inspect and approve plans for major construction projects. Muhammad Ali is one of the most important athletes and cultural figures in American history. Though he passed away in , the heavyweight boxing champ was larger than life in and outside of the ring.
Here are five more fast facts about Muhammad Ali, a. The original Cassius Clay was a wealthy 19th-century planter and politician who not only published an anti-slavery newspaper, but also emancipated every slave he inherited from his father. According to his religious beliefs, Ali refused to serve in the Vietnam War when he was drafted in April He was arrested and stripped of his boxing license and heavyweight title.
On June 20, , he was convicted of draft evasion and banned from fighting while he remained free on appeal.
His case went all the way to the U. Supreme Court, which unanimously overturned his conviction in At the Summer Olympics in Rome, Ali won the gold medal for boxing in the light heavyweight division. But, as he wrote in his autobiography, The Greatest: My Own Story edited by Toni Morrison! Some historians dispute this story and suggest that Ali just lost the medal.