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Simply put to insure quality...
There are many kinds of calibration standards out there. We at, Exaxol, make ICP, AA, Ion Chromatography, EPA, pH, and Conductivity standards among other things. They all have different shelf lives due to there matrix or stabilizers. Many require high purity acids to dissolve in solution and over time CO2 from the air will make carbonic acid in your standardized solution. This will affect pH dependent solutions and add impurities.
Tolerances are a big deal in many industries and even mechanical and digital measuring devices such as scales and electrodes need to be checked annually to maintain accuracy in your work.
I added a link to a more lengthy pH discussion if you were looking for more than a short answer response!
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How many three of diamonds are in a 52 deck of cards?
There is 1 Three of Diamonds in a standards 52 card deck of cards.
Is every set of three points collinear?
No.
What every 3 days mean?
"Every 3 days" refers to a frequency of occurrence where an event happens once every three days. This means that after an initial event, the next occurrence will take place three days later, and subsequently every three days thereafter. This pattern continues consistently, with the event happening regularly at intervals of three days.
How many principle parts does every verb have?
Three
Is every set of three number coplanar?
Yes.
