Hi,

I'm new to SMath. It's a great software but I'm frustrated with an (maybe simple) error.

I try to calculate a density wich follows a simple linear equation:

The equation is: D = 0,0006x+1
x stands for the mass.

Now I try to calculate the density with different masses:



How you see I can't solve the second equation with the unit "g". SMath shows "Unit don't match". I try different ways to insert units but it doesn't work in any direction.
So, what can I do? Where is the failure?

Thanks in advance for your help!

The formulation you wrote for the density calculation (linear equation) would suggest a dimensionless formulation (those typical equations contained in technical manuals or codes). Therefore it must be used in dimensionless form with the quantities inserted without a unit of measurement. With m2 you have instead used a unit of measurement that caused the error by not being able to add up a dimensionless quantity (1) with a quantity with unit of measure (g)
sergio

Thank you for quick reply!

I will calculate it dimensionless.

The 2 typical approaches; as said by Sergio the dimensionless operand drives the result:

https://en.smath.com/cloud/worksheet/3ecekeDo

Wrote

So, what can I do?

... work Engineering/Scientific projects Unitless
Maths are unitless, so projects using maths.
IMHO, the attached is a good example.

Inst_Colebrook Pipe Data.sm (59,42 KiB) descargado 1249 vez(es).

Thanks for all answers!

Wrote

Thanks for all answers!

Knowing in what units the document is designed/produced,
you can always append the unit in the result ... like this:
you can't define kg/m³:=1
otherwise kg_m³:=1

This SS 6179 should work in your latest SS version.
Cheers ... Jean



Inst_Type J Genfit Rational J_8.sm (96,66 KiB) descargado 1216 vez(es).