1. Metric System SI Standards – Length unit: meter (m) – Massunit: kilogram (kg) – Timeunit: second (s) – Electric currentunit: ampere (A) – Temperatureunit: Kelvin (K)

2. ***Need to memorize the following prefixes: Giga(G)1,000,000,00010 9 Mega (M) 1,000,000 10 6 Kilo(k) 1,000 10 3 hecto(h) 100 10 2 Deka (da)10 10 1 Deci(d)1/10 10 -1 centi (c) 1/100 10 -2 milli(m) 1/1000 10 -3 micro(μ)1/1000000 10 -6 nano(n)1/100000000010 -9 Prefix Abbreviation Conversion FactorScientific Notation

4. Accuracy vs. Precision What’s the difference and how can we tell?

5. Accuracy  Accuracy: how close a measured value is to the true value of the quantity measured.  Getting what you aim for. ◦ Method Error ◦ Instrument Error ◦ Human Error A measurement can be precisely inaccurate…..

6. Accuracy

7. Accuracy vs. Precision Precision – refers to the degree of exactness with which a measurement is made and stated. Means that consistent results are obtained Consistent

8. 1-2 Precision

9. 1-2 Accurate and/or Precise?

10. Scientific Notation 1. 1001 = 1.001 x 10 3 2. 53 = 3. 6,926,300,000 = 4. -392 = 5. 0.00361 = Write the following numbers in scientific notation 1. 1.92 x 10 3 = 1920 2. 3.051x10 1 = 3. -4.29 x 10 2 = 4. 6.251 x 10 9 = 5. 8.317 x 10 6 = Convert back 1. (2 x 10 5 ) + (3 x 10 5) = 2. (8 x 10 4 ) - (2 x 10 4) = 3. (2 x 10 5 ) x (3 x 10 2) = 4. (8 x 10 4 ) ÷ (2 x 10 2) = Add/Sub & Mult/Div 1. 15 Km = ? m 2. 1500 g = ? Kg 3. 15 m 4. (8 x 10 4 ) ÷ (2 x 10 2) = Convert