A.
Why?
Scientists do a lot of measuring. When scientists use an instrument (such as a ruler, graduated cylinder,
spectrophotometer or balance) to measure something, it is important to take full advantage of the instru-
ment. However, they can't cheat and record a better measurement than the instrument is capable of. There
is an understanding among scientists of the proper way to record valid measurements from any instru-
ment. When you are the scientist, you must record data in this way. When you are reading other scientists'
work, you must assume they recorded their data in this way.
Model 1 - Ruler A
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0 cm
Significant Digits and Measurement
What digits are significant when recording a measurement?
10
Susan
Maya
Jonah
Tony
Emily
Dionne
1. What distances can you be certain of on the ruler in Model 1?
3 cm
2 cm
2.5 cm
3.00 cm
34 cm
3.33 cm