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Mr Kremer’s
Grade 9 Class
Measuremen
ts in Science
Image: http://www.bjj.org/another-zombie-attack
SI Units
Dimensional Analysis
Dimensional Analysis
Dimensional Analysis
How many
seconds in 2.4
hours?
2.4 hrs 60 min 60 s
1 hr 1 min 8640 s
Dimensional Analysis
How many days
in 5.9x106
s?
How many
gigaseconds in
3.2x1012
nanoseconds?
How many dg in
1.2 kg? How ...
Dimensional Analysis
What if there are
multiple units in the
question?
Example:
How many
km/hr is 5.6
m/s?
1st convert one...
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!
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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!

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