The document discusses dimensional analysis and converting between different units of measurement in science. It provides examples of converting between units like hours and seconds, seconds and days, and between metric and other units like kilometers and meters. The key aspects are understanding the relationships between units and setting up proportional relationships to perform unit conversions through dimensional analysis.

1. Mr Kremer’s
Grade 9 Class
Measuremen
ts in Science
Image: http://www.bjj.org/another-zombie-attack

2. SI Units

3. Dimensional Analysis

4. Dimensional Analysis

5. Dimensional Analysis
How many
seconds in 2.4
hours?
2.4 hrs 60 min 60 s
1 hr 1 min 8640 s

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. 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. 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!