If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.7 psi. Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. At sea level, Earth's atmosphere actually exerts a pressure of 14.7 psi.
By contrast, psia measures pressure relative to a vacuum (such as that in space). Psig (pound-force per square inch gauge) is a unit of pressure relative to the surrounding atmosphere. Its official symbol is "bar" the earlier "b" is now deprecated, but still often seen especially as "mb" rather than the proper "mbar" for millibars. The word bar is of Greek origin, báros meaning weight. The bar is a measurement unit of pressure, equal to 1,000,000 dynes per square centimetre (baryes), or 100,000 newtons per square metre (pascals). Psig to bar, or enter any two units below: Enter two units to convert From: Image Courtesy:ġ.You can do the reverse unit conversion from “Pounds per Square Inch.” Wikipedia, Wikimedia Foundation, 9 Apr. The key difference between psi and bar is that psi measures the pressure as the one-pound force applied on an area of one square inch whereas bar measures the pressure as a force applied perpendicularly on a unit area of a surface. Psi and bar are units of measurement of pressure. So, this is another difference between psi and bar. When considering the relationship between two units, one psi equals 0.068 bar while one bar equals 14.50 psi. Specifically, psi measures pressure or stress, whereas bar only measures pressure. The key difference between psi and bar is that psi measures pressure as a one-pound force applied on an area of one square inch whereas bar measures pressure as a force applied perpendicularly on a unit area of a surface. Psi and bar are two common units we use to measure pressure. What is the Difference Between Psi and Bar? Some other units derived from bar include Megabar, Kilobar, Decibar, Centibar and Millibar. However, this value is slightly different from the average atmospheric pressure at sea level. What is Bar?īar is a unit of measurement which gives the pressure as the force applied perpendicularly on a unit area of a surface. The ksi unit is important in material sciences to measure tensile strength while Mpsi or mega pounds per square inch is important in mechanics as it measures elastic modulus (mainly in metals). Further, thousand psi equals kilopounds per square inch abbreviation ksi indicates this.
One psi is approximately equal to 6895 N/m 2. Moreover, this unit comes in the avoirdupois unit system. More accurately, the unit psi is useful to measure either pressure or stress. Psi is a unit of measurement of pressure which gives the pressure as the one-pound force applied on an area of one square inch of a surface. Side by Side Comparison – Psi vs Bar in Tabular Form For example, the avoirdupois system uses pounds and ounces for measurements and its pressure is the one-pound force applied on an area of one square inch. However, there are different systems that measure pressure differently.
Pressure, in general, is the force perpendicularly applied on a unit area of a surface.
The key difference between psi and bar is that psi measures pressure as a one- pound force applied on an area of one square inch whereas bar measures pressure as a force applied perpendicularly on a unit area of a surface.
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