Information about Standard Gravity
Standard gravity, usually denoted by g0 or gn, is the nominal acceleration due to gravity at the Earth's surface at sea level. By definition it is equal to exactly 9.80665 m·s−2 (approx. 32.174 ft·s−2).[1] This value was established by the 3rd CGPM (1901, CR 70).
The symbol g is sometimes also used for standard gravity, but g strictly means the local acceleration due to gravity, which varies depending on one's position on Earth. The symbol g should not be confused with G, the gravitational constant, or g, the abbreviation for gram (which is not italicized). The g (pronounced "gee") is also used as a unit of acceleration, with the value defined as above; see g-force.
The value of g0 defined above is an arbitrary midrange value on Earth, approximately equal to the acceleration of a body in free fall (in the absence of air resistance) at sea level at a geodetic latitude of about 45.5°. It is larger in magnitude than the average sea level acceleration on Earth, which is about 9.797 645 m·s−2. Although the actual strength of gravity on Earth varies according to location (see Earth's gravity), for weights and measures and many calculation purposes the standard gravity figure is used.
The SI units of acceleration due to gravity (or, indeed, any acceleration), namely meters per square second, are interchangeable with newtons per kilogram. The numerical value, 9.80665, stays the same. These alternative units may be more intuitive when considering problems involving pressure due to gravity, or weight. For example, under standard gravity a mass of 1 kilogram exerts a weight force of 9.80665 newtons.
The symbol g is sometimes also used for standard gravity, but g strictly means the local acceleration due to gravity, which varies depending on one's position on Earth. The symbol g should not be confused with G, the gravitational constant, or g, the abbreviation for gram (which is not italicized). The g (pronounced "gee") is also used as a unit of acceleration, with the value defined as above; see g-force.
The value of g0 defined above is an arbitrary midrange value on Earth, approximately equal to the acceleration of a body in free fall (in the absence of air resistance) at sea level at a geodetic latitude of about 45.5°. It is larger in magnitude than the average sea level acceleration on Earth, which is about 9.797 645 m·s−2. Although the actual strength of gravity on Earth varies according to location (see Earth's gravity), for weights and measures and many calculation purposes the standard gravity figure is used.
The SI units of acceleration due to gravity (or, indeed, any acceleration), namely meters per square second, are interchangeable with newtons per kilogram. The numerical value, 9.80665, stays the same. These alternative units may be more intuitive when considering problems involving pressure due to gravity, or weight. For example, under standard gravity a mass of 1 kilogram exerts a weight force of 9.80665 newtons.
References
1. ^ The notation m·s−2 means meters per second per second, and the notation ft·s−2 means feet per second per second.
See also
- Earth's gravity
- g-force, a measure of apparent acceleration
- G, the gravitational constant in Newton's law of gravity
- Gravitational acceleration
External Links
- http://physics.nist.gov/Document/sp330.pdf (pg.29 in document or pg. 39 of pdf)
- http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf (pg.143 in document or pg. 51 of pdf)
Earth's gravity, denoted by g, refers to the attractive force that the Earth exerts on objects on or near its surface (or, more generally, objects anywhere in the Earth's vicinity).
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The General Conference on Weights and Measures is the English name of the Conférence générale des poids et mesures (CGPM, never GCWM). It is one of the three organizations established to maintain the International System of Units (SI) under the terms of the Convention
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gravitational constant, the universal gravitational constant, Newton's constant, and colloquially Big G. The gravitational constant is a physical constant which appears in Newton's law of universal gravitation and in Einstein's theory of general
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g-force (also g-load) is a measurement of an object's acceleration expressed in g's. It may also informally refer to the reaction force resulting from an acceleration, with the causing acceleration expressed in g's.
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equator divides the planet into a Northern Hemisphere and a Southern Hemisphere, and has a latitude of 0. Latitude, usually denoted symbolically by the Greek letter phi, , gives the location of a place on Earth north or south of the equator.
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Earth's gravity, denoted by g, refers to the attractive force that the Earth exerts on objects on or near its surface (or, more generally, objects anywhere in the Earth's vicinity).
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The newton (symbol: N) is the SI derived unit of force, named after Sir Isaac Newton in recognition of his work on classical mechanics.
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Definition
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kilogram or kilogramme (symbol: kg) is the SI base unit of mass. The kilogram is defined as being equal to the mass of the International Prototype Kilogram (IPK), which is almost exactly equal to the mass of one liter of water.
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Pressure (symbol: p) is the force per unit area applied on a surface in a direction perpendicular to that surface.
Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.
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Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.
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weight is a measurement of the gravitational force acting on an object. Near the surface of the Earth, the acceleration due to gravity is approximately constant; this means that an object's weight is roughly proportional to its mass.
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Earth's gravity, denoted by g, refers to the attractive force that the Earth exerts on objects on or near its surface (or, more generally, objects anywhere in the Earth's vicinity).
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g-force (also g-load) is a measurement of an object's acceleration expressed in g's. It may also informally refer to the reaction force resulting from an acceleration, with the causing acceleration expressed in g's.
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gravitational constant, the universal gravitational constant, Newton's constant, and colloquially Big G. The gravitational constant is a physical constant which appears in Newton's law of universal gravitation and in Einstein's theory of general
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Gravitation is a natural phenomenon by which all objects with mass attract each other. In everyday life, gravitation is most familiar as the agency that endows objects with weight.
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In physics, gravitational acceleration is the acceleration of an object caused by the force of gravity from another object. An interesting fact is that any object will accelerate towards a large object at the same rate, regardless of the mass of the object.
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