18 psi to bar conversion result above is displayed in three different forms: as a decimal (which could be rounded), in scientific notation (scientific form, standard index form or standard form in the United Kingdom) and as a fraction (exact result). Every display form has its own advantages and in different situations particular form is more convenient than another. For example usage of scientific notation when working with big numbers is recommended due to easier reading and comprehension. Usage of fractions is recommended when more precision is needed.
If we want to calculate how many Bars are 18 Pounds per Square Inch we have to multiply 18 by 8896443230521 and divide the product by 129032000000000. So for 18 we have: (18 × 8896443230521) ÷ 129032000000000 = 1.6013597814938E+14 ÷ 129032000000000 = 1.2410563127703 Bars
So finally 18 psi = 1.2410563127703 bar