What does "2-3 bars steam pressure" mean?

Answers:
1 Bar is defined as 14.5 PSI (pound-force per square inch). Standard atmospheric pressure is measured at sea level and some standard temperature, and is taken as 14.7 PSI. The BAR scale uses the 14.5 PSI as the standard sea level pressure. So 2 bar = 29 psi, where 2 standard atmospheres would equal 29.4 psi. The errors are small at pressures near the standard 1 atmosphere as 14.7 PSI. Steam is not really important to the question of pressure. Pounds per square inch applies to liquids, solids, and gases.

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The bar (symbol bar) and the millibar (symbol mbar, also mb) are units of pressure. They are not SI units, but accepted (although discouraged) for use with the SI. The bar is still widely used in descriptions of pressure because it is about the same as atmospheric pressure.

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