![]() ![]() p. 66.Water-to-cement ratio: A lower water-to-cement ratio makes for stronger concrete, but it also makes the concrete more challenging to work with. National Institute of Standards and Technology. ^ NIST Special Publication 811 – Guide for the Use of the International System of Units (SI) (PDF).^ BS 350: Part 1: 1974 – Conversion factors and tables.^ "An example of the use of Mpsi in mechanics for the elastic moduli of several materials".The tensile strength of steel may also be shown in MPa, or megapascal. ![]() For example, a tensile strength of a steel that can withstand 40,000 pounds of force per square inch may be expressed as 40,000 PSI or 40 KSI (with K being the for thousands of pounds). A metal's yield strength and ultimate tensile strength values are expressed in tons per square inch, pounds per square inch or thousand pounds (ksi) per square inch. ^ "Tensile Strength of Steel and Other Metals".Archived from the original on August 1, 2011. ^ "Glossary of Industrial Air Cleaning Technology".^ IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units), IEEE Std 260.1™-2004 (Revision of IEEE Std 260.1-1993).The conversions to and from SI are computed from exact definitions but result in a repeating decimal. Ultimate strength of ASTM A36 steel: 58,000 psi.Land Rover Td5 diesel engine fuel injection pressure: 22,500 psi.Airbus A380 hydraulic system: 5000 psig.Full SCBA (self-contained breathing apparatus) for interior firefighting operations: 4500 psig.Full SCUBA (self-contained underwater breathing apparatus) tank overpressure (common): 3000 psig.Full SCBA (self-contained breathing apparatus) for IDLH (non-fire) atmospheres: 2216 psig.Union Pacific Big Boy steam locomotive boiler: 300 psig.Steam locomotive fire tube boiler (UK, 20th century): 150–280 psig.Road racing bicycle tire overpressure: 120 psig.Air brake (rail) or air brake (road vehicle) reservoir overpressure (common): 90–120 psig.Bicycle tire overpressure (common): 65 psig.Automobile tire overpressure (common): 32 psig.Atmospheric pressure at sea level (standard): 14.7 psia.Boost pressure provided by an automotive turbocharger (common): 6–15 psig. ![]() ![]()
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