what instrument is used for measuring the external diameter of a single piece of wire
2007-02-21 21:39:08 · 11 answers · asked by omosco10 2 in Science & Mathematics ➔ Other - Science
Either a micrometer or vernier caliper depending on the thickness. If it is more than about 1cm - a vernier should be used, anything thinner the micrometer is more accurate.
Unless you use an optical microscope with a measurement graticule.
2007-02-21 22:06:15 · answer #1 · answered by Doctor Q 6 · 0⤊ 0⤋
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You measured the diameter of the wire in order to determine its cross-sectional area (CSA). If the diameter = d, then the CSA = pi.d²/4. Hence, the %-age error in d has caused an %-age error in A of twice as much, since A is proportional to d². Let me explain . . . . . . . . . Let the error in d = δd So the actual measurement of d = (d + δd). Let the resultant error in A = δA. Then the resultant value of A, with that error = (A + δA) But we know that the CSA, A = kd², where k = pi/4 and d = the actual diameter. Therefore, (A + δA) = k.(d + δd)². Therefore, δA = k.(d + δd)² - A = k.(d + δd)² - kd². So: δA = [kd² + 2k.d.δd + k(δd)²] - kd² Since (δd)² is a very tiny quantity, we can ignore it for all practical purposes and equate it to zero. Therefore: δA = [kd² + 2k.d.δd] - kd² = (k.d).(2.δd.) Hence, δA / δd = 2.k.d Thus the size of the error in d produces twice the size of the corresponding error in A. So to determine the resultant error in A, the known error in d must be doubled.
2016-04-03 01:26:58 · answer #2 · answered by Teresa 4 · 0⤊ 0⤋
To be precised the most commonly used tool for measuring in industry would be an "Outside Micrometer"
its accuracy is commonly .001 in.
2007-02-22 20:41:56 · answer #3 · answered by Anonymous · 0⤊ 0⤋
A micrometer
2007-02-21 23:16:56 · answer #4 · answered by burning brightly 7 · 0⤊ 0⤋
A micrometer is the best instrument as it is the most precise.
2007-02-21 23:20:46 · answer #5 · answered by Tiger Beer 2 · 0⤊ 0⤋
A micrometer calliper?
2007-02-21 21:47:16 · answer #6 · answered by Labsci 7 · 0⤊ 0⤋
Screw Guage or Vernier Caliperse
2007-02-21 23:43:33 · answer #7 · answered by GS 3 · 0⤊ 0⤋
Micrometer or the Screw gauge.
2007-02-21 22:28:50 · answer #8 · answered by Anonymous · 0⤊ 0⤋
I agree
2007-02-21 23:19:47 · answer #9 · answered by Comfortably Numb 3 · 0⤊ 0⤋
micrometer
2007-02-21 21:50:16 · answer #10 · answered by Anonymous · 0⤊ 0⤋