The density of air is 1.2 kg/m3. It can be expressed in g/cm3 by:
Correct answer: D. 1.2 x 10^-3
- A. 1.2 x 10^6
- B. 1.2 x 10^3
- C. 1.2 x 10^-6
- D. 1.2 x 10^-3
Explanation
To convert kg to g we will multiply by 1000. To convert cm to m we divide by 100 so, to convert cm3 to m3 we will divide by 1003 = 1000000.1.2 x 1000 = 12001200 / 1000000 = 0.0012 0.0012 = 1.2 x 10-3
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About Measurements
Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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