Bar (unidade)

O bar, com símbolo bar e plural bares[1] (do grego barys, significando "pesado"),[2] é uma unidade de pressão e equivale a exatamente 100 000 Pascais (105 Pa). Este valor de pressão é muito próximo ao da pressão atmosférica padrão, que é definido como 101.325 Pa.

É frequente medir a pressão atmosférica em milésimos de bar (mbar) e também pressões de diversos sistemas hidráulicos e pneumáticos, onde pode-se utilizar a relação 1 bar = 14,5 Psi.

Outras equivalências:

  • 1 bar = 76,00617 centímetros de mercúrio
  • 1 bar = 100 kPa = 100 000 Pa
  • 1 bar = 1.000.000 dina por centímetro quadrado

Quando a pressão é dada relativamente à pressão atmosférica, representa-se a medida por barg ou bar(g), da expressão bar gauge.

Unidades de pressão e fatores de conversão
  Pa bar at atm Torr psi
1 Pa ≡ 1 N/m² = 10−5 bar ≈ 10,2·10−6 at ≈ 9,87·10−6 atm ≈ 7,5·10−3 Torr ≈ 145·10−6 psi
1 bar = 100 000 Pa ≡ 106 dyn/cm² ≈ 1,02 at ≈ 0,987 atm ≈ 750 Torr ≈ 14,504 psi
1 at = 98 066,5 Pa = 0,98 bar ≡ 1 kgf/cm² ≈ 0,968 atm ≈ 736 Torr ≈ 14,223 psi
1 atm = 101 325 Pa = 1,01325 bar ≈ 1,033 at ≡ 101 325 Pa = 760 Torr ≈ 14,696 psi
1 Torr ≈ 133,322 Pa ≈ 1,333·10−3 bar ≈ 1,360·10−3 at ≈ 1,316·10−3 atm ≈ 1 mmHg ≈ 19,337·10−3 psi
1 psi ≈ 6894,757 Pa ≈ 68,948·10−3 bar ≈ 70,307·10−3 at ≈ 68,046·10−3 atm ≈ 51,7149 Torr ≡ 1 lbf/in²

Referências

  1. ↑ [email protected] (28 de janeiro de 2016). «NIST Guide to the SI, Chapter 9: Rules and Style Conventions for Spelling Unit Names». NIST (em inglês). Consultado em 6 de março de 2020 
  2. ↑ «Singular e plural». Norma Culta. Consultado em 6 de março de 2020 

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