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Answer:
Obviously one must define more exactly the influence factors
for the quantity to be measured !
Question:
Can we fix all measuring conditions?
GUM
How to know the “true value”?
Answer:
In principle, the quantity to be measured
cannot be
completely
described without an
infinite
amount of
information.
If it is impossible to define
all conditions,
the "true value"
must ultimately remain unknown
Consequence:
If the true value remains unknown, the value of an "
error
"
and even worse, also that of "
accuracy
“ can not be exactly
evaluated and therefore also must remain unknown.
5.2
19