ECOR 1010 Lecture Notes - Lecture 4: Metric Prefix, Engineering Notation, Scientific Notation
Document Summary
Si prefix: 109 - giga, 106 - mega, 103 - kilo, 10-3 - milli, 10-6 - micro, 10-9 - nano. Writing units: space between numeric values and unit, units cannot be modified with subscripts, unit symbols not mixed with unit names, long numbers groups into 3 broken by a space. Notations: fixed notation ordinary decimal notation 30 140. 0, scientific notation 3. 014 x 104, engineering notation exponent of 10 must correspond to si prefixes 30. 14 x 103. Dimensions differ slightly from units (dimension of speed = distance/ time)(unit of speed = m/s) Fundamental dimensions independent from the units of measurement: distance, time, mass, temperature etc. Non-dimensional numbers- all numerator dimensions cancel all denominator dimensions. Uncertainty: measured values are not perfect. Systematic errors: consistent deviation forms the true value, error when there are repeated measurements under the same conditions, can be detected by comparison with results obtained with an independent method.