Open Question
a. What is the specific gravity of the following solution?
2. Measurement and Problem Solving
Significant Figures: Precision in Measurements
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Read the length of the metal bar to the correct number of significant figures.
A
15 cm
B
15.000 cm
C
20 cm
D
15.0 cm
E
15.00 cm
Verified step by step guidance1
Observe the image of the metal bar placed against a ruler. The ruler is marked in centimeters with smaller divisions indicating millimeters.
Identify the point where the end of the metal bar aligns with the ruler. In this image, the end of the bar aligns with the 15 cm mark.
Determine the precision of the measurement by examining the smallest division on the ruler. The smallest division is 1 mm, which is 0.1 cm.
To express the measurement with the correct number of significant figures, consider the precision of the ruler. Since the smallest division is 0.1 cm, the measurement should be expressed to two decimal places.
Thus, the length of the metal bar should be recorded as 15.00 cm to reflect the precision of the measurement tool used.
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