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Substitution Method |
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substitution method [‚səb·stə′tü·shən ‚meth·əd]
(physics) Any method of measurement, such as substitution weighing, in which a quantity is determined by substituting for it a known quantity which produces the same effect. Substitution Method a method for eliminating systematic measurement errors caused by errors in the measuring instrument used to compare the quantity being measured with a standard. In the substitution method the value of the quantity being measured is not found indirectly, from a reading of the measuring instrument, but rather from the magnitude of the standard, which is selected or regulated in such a way that the reading of the measuring instrument remains the same when the quantity being measured is replaced by the standard. For example, when weighing an object on a beam balance, the object is taken from the pan and replaced by weights of equal total weight; the balance will show the previous reading (the Borda method). The substitution method is extensively used in measuring electrical quantities, such as resistance, capacitance, and inductance. K. P. SHIROKOV Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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