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Yes it can be converted into a rational number.
Let x = 2.19 bar
then, 10x = 21.9 bar (equation 1)
100x= 219.9 bar (equation 2)
(equation 2) - (equation 1)= 90x = 198
then x = 198/90 = 11/5
Thus 11/5 is the rational number form of 2.19 bar
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