cancel
Showing results for
Did you mean:
cancel
Showing results for
Did you mean:

SOLVED
Visitor

## Calculation result with and without units is different (bug?)

Hello,

I found a wired behaviour using units in calculations. The result is slightly different if units are used in formula or not. See attached file. Both results must be identical, but they are not. I can even do the calculation in my head and the one with unit is false.

Cheers DPJB

Tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions

## Re: Calculation result with and without units is different (bug?)

Not a bug.Temperature units are weird.

Realize that 0 °C = 273.15 K.

So without units you are multiplying with 0^3=0 in the last term when t=0.

But when t=0 °C, you are multiplying with (273.15 K)^3.

You should define your constants A, B and C with K, or Delta°C, but not with °C. And you should adapt your formula to include a reference temperature, is that 0 °C ?

Success!
Luc

4 REPLIES 4

## Re: Calculation result with and without units is different (bug?)

Not a bug.Temperature units are weird.

Realize that 0 °C = 273.15 K.

So without units you are multiplying with 0^3=0 in the last term when t=0.

But when t=0 °C, you are multiplying with (273.15 K)^3.

You should define your constants A, B and C with K, or Delta°C, but not with °C. And you should adapt your formula to include a reference temperature, is that 0 °C ?

Success!
Luc

## Re: Calculation result with and without units is different (bug?)

The "units" for temperature can be quite confusing.

Keep in mind, that behind the scenes Prime only uses the base unit Kelvin!

°C is not a unit you can cancel because its not just a multiplication factor.

## Re: Calculation result with and without units is different (bug?)

I wish everyone to have a body temperature 615 cpm and not get sick!

Announcements
Check out the latest