So, to convert directly from bar to pounds per square inch, you multiply by 14.503774. Or, you can find the single factor you need by dividing the A factor by the B factor.įor example, to convert from bar to pounds per square inch you would multiply by 100000 then divide by 6894.757. To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into Pascals then divide by the factor for B to convert out of Pascals. To convert from Pa into units in the left columnĭivide by the value in the right column or, multiply by the reciprocal, 1/x.ĥ00000 Pa / 100000 = 5 bar Multiply by the conversion value in the right column in the table below.ĥ bar * 100000 = 500000 Pa 3 This standard is also called normal temperature and pressure (abbreviated as NTP ). NIST uses a temperature of 20 C (293.15 K, 68 F) and an absolute pressure of 1 atm (14.696 psi, 101.325 kPa). To simply convert from any unit into pascals, for example, from 5 bar, just Since 1982, STP has been defined as a temperature of 273.15 K (0 C, 32 F) and an absolute pressure of exactly 10 5 Pa (100 kPa, 1 bar ). Various units are used to express pressure. 1 : 445 Gauge pressure (also spelled gage pressure) a is the pressure relative to the ambient pressure. Where S is our starting value, C is our conversion factor, and 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. How to Convert Units of PressureĬonversions are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem: 2 The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth that is, the Earth's atmospheric pressure at sea level is. Some are obvious, such as pounds per square inch, but even the SI standard Pascal is actually an expression of one Newton per square meter. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa ), which is equivalent to 1,013.25 millibars, 1 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. Since pressure is derived from force and area, many units for pressure directly relate force to area. Where P is equal to pressure, F is the normal force and A is area. 1 shows two representations of how Boyle’s Law works. This particular gas law is called Boyle's Law, after the English scientist Robert Boyle, who first announced it in 1662. Pressure is a scalar quality reflecting how force acts on a surface. A gas law is a simple mathematical formula that allows you to model, or predict, the behavior of a gas.
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