# Unit of Expression

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 May 27, 2004, 01:40 Unit of Expression #1 Fing Guest   Posts: n/a Sponsored Links Hello, I would like to input a viscosity expression but I can not how to solve the problem of the unit of the expression. My expression will be: M_u = exp(1.2 - 2.9*log_e(4.5*sstrnr)) where M_u is dynamic viscosity, sstrnr is the strain rate. How can I solve the unit problem? Thanks, Fing

 May 27, 2004, 03:41 Re: Unit of Expression #2 matej Guest   Posts: n/a What I allways do is simple trick. in logs and exps multiplying the variables with 1 of reciprocal unit, and multiplying the result with a 1.0 with the desired unit. if you have a some variable A [m^2] in a exp(A), and you want the result B in [K] using formula B= 100.0*exp(A), (really silly example), what you do is: B=100.0 [K] * exp(A *1.0 [m^-2]) and that's it! matej

 May 27, 2004, 10:17 Thank you, matej #3 Fing Guest   Posts: n/a Thanks, matej. Regards, Fing

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