Significant Figures Revisited Let’s take a look at some instruments used to measure --Remember: the instrument limits how good your measurement is!!

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Presentation transcript:

Significant Figures Revisited Let’s take a look at some instruments used to measure --Remember: the instrument limits how good your measurement is!!

Significant figures (sig figs) We can only MEASURE at the lines on the measuring instrument We can only MEASURE at the lines on the measuring instrument We can (and do) always estimate between the smallest marks. We can (and do) always estimate between the smallest marks in

4.5 inches What was actually measured? What was estimated? 4 inches 0.5 inches in

Significant figures (sig figs) The better marks… the better we can measure. The better marks… the better we can measure. Also, the closer we can estimate Also, the closer we can estimate in 21345

inches What was actually measured? What was estimated? in 4.5 inches 0.05 inches

So what does this all mean to you? Whenever you make a measurement, you should be doing three things Whenever you make a measurement, you should be doing three things 1. Check to see what the smallest lines (increments) on the instrument represent 2. Measure as much as you can (to the smallest increment allowed by the device) 3. Estimate one decimal place further than you measured

Decimal Places Review thousandths hundredths tenths ones tens hundreds thousands ten thousands Your estimate MUST always be one (and only one) decimal place further to the right than your measurement

Practice Your graduated cylinder can only accurately measure to tens of mL. To what decimal place should you estimate? A balance can accurately measure to hundredths of grams. What decimal place will your estimate be?

Work Backwards Now Look at the following measurements and determine the smallest increment that the measuring instrument could accurately measure to. Keep in mind that the last significant figure is an estimate g 207 L 1500 cm kg ones tens thousands One-hundred thousandths

What is measured and what is estimated in the following measurements? Remember, only significant figures (digits) are measured or estimated Sig Figs ; Measured: 100. ; Estimated: Sig Figs ; Measured: 2.0 X 10 2 ; Estimated: 7 2 Sig Figs ; Measured: 1000 ; Estimated: Sig Figs ; Measured: ; Estimated: