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# Measurements in science

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This presentation walks students through the basic skills of unit conversion in scientific applications. Designed for a 9th-grade general science class.

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### Measurements in science

1. 1. Mr Kremer’s Grade 9 Class Measuremen ts in Science Image: http://www.bjj.org/another-zombie-attack
2. 2. SI Units
3. 3. Dimensional Analysis
4. 4. Dimensional Analysis
5. 5. Dimensional Analysis How many seconds in 2.4 hours? 2.4 hrs 60 min 60 s 1 hr 1 min 8640 s
6. 6. Dimensional Analysis How many days in 5.9x106 s? How many gigaseconds in 3.2x1012 nanoseconds? How many dg in 1.2 kg? How many m2 in 100 cm2 ?
7. 7. Dimensional Analysis What if there are multiple units in the question? Example: How many km/hr is 5.6 m/s? 1st convert one unit. In this case, m ➜ km Next convert the other unit. In this case, s hr➜ 20.16 km/hr (5.6 x 1 x 60 x 60) (1 x 1000 x 1 x 1) 5.6 m 1 km 60 s 60 min s 1000 m 1 min 1 hr
8. 8. Dimensional Analysis 60 km/hr in m/s? 90 km3 in m3 ? 52 Mm/hr2 in m/s2 ? 19 mg μm/hr2 in kg m/s2 ? PRACTICE THESE!