Numbers in Science Chapter 2. Measurement. What is measurement? Quantitative Observation Based on a comparison to an accepted scale. A measurement has 2 Parts – the Number and the Unit Number Tells Comparison Unit Tells Scale There are two common unit scales English Metric. The Unit.
in milliliters (mL)
Any idea what the three most common temperature scales are?
1. Locate the Decimal Point : 1,438.
2. Move the decimal point to the right of the non-zero digit in the largest place
- The new number is now between 1 and 10
3. Now, multiply this number by a power of 10 (10n), where n is the number of places you moved the decimal point
- In our case, we moved 3 spaces, so n = 3 (103)
4. Determine the sign on the exponent n
If the decimal point was moved left, n is +
If the decimal point was moved right, n is –
If the decimal point was not moved, n is 0
Try it for these numbers: 2.687 x 106 and 9.8 x 10-2
1.34 x 1012
6.97 x 105
9.12 x 10-12
If the digit to be removed
In a series of calculations, carry the extra digits to the final result and then round off
Don’t forget to add place-holding zeros if necessary to keep value the same!! Round 80,150,000 to 3 sig figs.
Answers must be in the proper number of significant digits!!!
Fundamental Unit 100
% error = measured value – accepted value x 100%