On 21/06/2010 1:43 PM, Invisible wrote:
>>> Given what the machine does, it seems plausible that the conversion is
>>> perfectly linear.
>>>
>>> A more important question is whether the conversion factor is *constant*
>>> or not...
>>
>> If it is linear then the conversion factor must be constant.
>
> What give you that idea?
>

Because hat's what linear means.

> It may be that the conversion is perfectly linear, but that the
> conversion factor depends on the chemical composition of what you're
> analysing.

For measuring mho's?

That is what you are measuring in the machine.

> So each time you analyse a set of samples, there is a linear
> conversion, but it's different each time.
>

Only if the cross sectional area or length of the sample is different.

You really need to read up on the physical properties of materials.


-- 

Best Regards,
	Stephen

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