![]() The inch of mercury is still used in the United States. Similar pressures are given in kilopascals (kPa) in most other fields, except aviation where the hecto- prefix is commonly used. Some meteorologists prefer the hectopascal (hPa) for atmospheric air pressure, which is equivalent to the older unit millibar (mbar). The usage of P vs p depends upon the field in which one is working, on the nearby presence of other symbols for quantities such as power and momentum, and on writing style. The IUPAC recommendation for pressure is a lower-case p. Pressure is the amount of force applied perpendicular to the surface of an object per unit area. Manometric units such as the centimetre of water, millimetre of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer. Pressure may also be expressed in terms of standard atmospheric pressure the atmosphere (atm) is equal to this pressure, and the torr is defined as 1⁄ 760 of this. Some of these derive from a unit of force divided by a unit of area the SI unit of pressure, the pascal (Pa), for example, is one newton per square metre (N/m 2) similarly, the pound-force per square inch ( psi, symbol lbf/in 2) is the traditional unit of pressure in the imperial and US customary systems. Various units are used to express pressure. : 445 Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure. The standard atmospheric pressure is 101,325 Pa or 0.101325 MPa.Īs with ksi, megapascal is also widely used in materials science to measure the tensile strength and the stiffness of materials.Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. 1 Pa = 1 N / 1 m 2Īs base units of SI, one Pascal can be expressed as 1 Pa = 1 kg / 1 m * s2 ![]() The Pascal is a measure of force per unit area is defined as one Newton per square metre. It is named after the French mathematician, inventor and physicist Blaise Pascal. It is more commonly used in many countries. The Pascal is an SI (Système International d’Unités) unit of pressure measurement. Megapascal is a multiple unit of Pascal (1 MPa = 1,000,000,000 Pa). One kilopound per square inch (ksi) is approximately 6.894759 MPa. The psi is an imperial unit of pressure measurement most commonly used in the United States, Burma and Liberia. For example, A36 steel has a tensile strength of 58 ksi. Ksi finds its application mostly in materials science to measure the tensile strength of metal beams. Ksi are used where the pressure measured is a large value of psi. 1 ksi = 1 psi * 1000 1 psi = 1 lbf / 1 in 2 (pounds per square inch) Kilo is widely used in the metric system and means one thousand. It is derived from one pound square inch (psi). Ksi (kilopound per square inch) is a unit of stress or pressure resulting from one kilopound force acting on an area of one square inch. Ksi values are commonly converted to MPa, as the metric system is the more widely used system of measurement. As you may guess, when using MPa you are usually working with something heavy or with a high pressure!īoth ksi (kilopound per square inch) and megapascal (MPa) are units of pressure measurement – the former is an Imperial unit of measurement and the latter a metric unit. Mega in this case means 1,000,000 and again it means “great”. It comes from the Greek word for 1000. Therefore, a kilopound is 1000 pounds.Ī Megapascal (or MPa) is a variation on a pascal. Kilo, which is often used in the metric system basically means a thousand (1000). Ksi means kilopound per square unit and is derived from psi(lbs/square inch). Measurements – Imperial and Metric explanation
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