The difference between the experimental mean and a true value is nominated as’ Absolute Error’. Absolute error may be positive (or) negative. Frequently a term’ Relative Error is used. The relative error refers to the value plant by dividing the absolute error by the true value.

• The relative error is generally expressed as per cent by multiplying the relative error by 100 or by expressing it as corridor per thousand by multiplying the relative error by 1000.
• Quite frequently, delicacy is expressed in terms of the relative error.

The term delicacy or accuracy refers to the agreement of experimental result with the true value and it’s generally expressed in terms of error. In scientific trials, it’s known that true value isn’t known. It’s simply the value that has been,’Accepted’and is generally a mean calculated from the results of several determinations from numerous laboratories employing different ways.

Perfection or Precision:
Precision may be defined as the degree of agreement between colorful results of the same volume. That is, it refers to the reproducibility of a result. Good rigor aren’t inescapably accurate. A constant error may always yield reproducible results yet swinging delicacy. An logical druggist always attempts for reproducible results ( i.e., perfection) to assure the loftiest possible delicacy.

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