![]() One pascal is the pressure exerted by a force of magnitude one newton perpendicularly upon an area of one square metre. Where N is the newton, m is the metre, kg is the kilogram, s is the second, and J is the joule. The pascal can be expressed using SI derived units, or alternatively solely SI base units, as:ġ P a = 1 N m 2 = 1 k g m ⋅ s 2 = 1 J m 3 The name pascal was adopted for the SI unit newton per square metre (N/m 2) by the 14th General Conference on Weights and Measures in 1971. The unit is named after Blaise Pascal, noted for his contributions to hydrodynamics and hydrostatics, and experiments with a barometer. In Canada these reports are given in kilopascals. Reports in the United States typically use inches of mercury or millibars (hectopascals). Meteorological observations typically report atmospheric pressure in hectopascals per the recommendation of the World Meteorological Organization, thus a standard atmosphere (atm) or typical sea-level air pressure is about 1013 hPa. Ĭommon multiple units of the pascal are the hectopascal (1 hPa = 100 Pa), which is equal to one millibar, and the kilopascal (1 kPa = 1000 Pa), which is equal to one centibar. The unit of measurement called standard atmosphere (atm) is defined as 101,325 Pa. The unit, named after Blaise Pascal, is defined as one newton per square metre and is equivalent to 10 barye (Ba) in the CGS system. The pascal (symbol: Pa) is the unit of pressure in the International System of Units (SI), and is also used to quantify internal pressure, stress, Young's modulus, and ultimate tensile strength. However, since torque represents energy transferred or expended per angle of revolution, one newton metre of torque is equivalent to one joule per radian.A pressure gauge reading in psi (red scale) and kPa (black scale) This usage is discouraged by the SI authority, since it can lead to confusion as to whether a given quantity expressed in newton-metres is a torque or a quantity of energy. In this very different usage the metre term represents the distance travelled or displacement in the direction of the force, and not the perpendicular distance from a fulcrum as it does when used to express torque. It is also used less commonly as a unit of work, or energy, in which case it is equivalent to the more common and standard SI unit of energy, the joule. ![]() One newton metre, sometimes hyphenated newton-metre, is equal to the torque resulting from a force of one newton applied perpendicularly to a moment arm which is one metre long. The newton metre is a unit of torque in the SI system. ![]() Similar examples of dimensionally equivalent units include Pa versus J/m3, Bq versus Hz, and ohm versus ohm per square.įreebase Rate this definition: 4.5 / 2 votes However, since torque represents energy transferred or expended per angle of revolution, one newton-metre of torque is equivalent to one joule per radian.Newton-metres and joules are dimensionally equivalent in the sense that they have the same expression in SI base units,īut are distinguished to avoid misunderstandings when a torque is mistaken for an energy or vice versa. This usage is generally discouraged, since it can lead to confusion as to whether a given quantity expressed in newton-metres is a torque or a quantity of energy. In this usage the metre term represents the distance travelled or displacement in the direction of the force, and not the perpendicular distance from a fulcrum as it does when used to express torque. The unit is also used less commonly as a unit of work, or energy, in which case it is equivalent to the more common and standard SI unit of energy, the joule. The nonstandard notation Nm occurs in some fields. ![]() One newton-metre is equal to the torque resulting from a force of one newton applied perpendicularly to the end of a moment arm that is one metre long. The newton-metre (also newton metre or newton meter symbol N⋅m or N m) is the unit of torque (also called moment) in the International System of Units (SI). Wikipedia Rate this definition: 0.0 / 0 votes ![]()
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