Measurement Science 10. Measurement and Precision Measurements are always approximate Measurements are always approximate There is always some error involved.

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Presentation transcript:

Measurement Science 10

Measurement and Precision Measurements are always approximate Measurements are always approximate There is always some error involved There is always some error involved Precision = the amount of information a measurement involves Precision = the amount of information a measurement involves Deals with the smallest division on the scale Deals with the smallest division on the scale Ex. Meter stick  readable to nearest mm Ex. Meter stick  readable to nearest mm

Accuracy Being able to produce the same result multiple times Being able to produce the same result multiple times Ex. 40.2, 40.3, 40.2 is pretty accurate Ex. 40.2, 40.3, 40.2 is pretty accurate Ex. 124, 129, 130 is not very accurate Ex. 124, 129, 130 is not very accurate

Estimating You can estimate the readings between the lines if you look carefully You can estimate the readings between the lines if you look carefully Scientists agree to only add one additional figure to their measurements in this way Scientists agree to only add one additional figure to their measurements in this way Ex. If you can read that it is 67cm on a ruler we can estimate it to be 67.3cm Ex. If you can read that it is 67cm on a ruler we can estimate it to be 67.3cm

What does the accuracy and precision of measurements tell you? What does the accuracy and precision of measurements tell you? This affects the significance of the numbers you are writing down. This affects the significance of the numbers you are writing down. Sig Figs!! Sig Figs!!

IMPORTANT! Before you get started with your readings it is necessary to determine the scale of the instrument Before you get started with your readings it is necessary to determine the scale of the instrument Is it in inches or centimetres? Is it in inches or centimetres? Does it go up by tenths? Does it go up by tenths? Does it go up by whole numbers? Does it go up by whole numbers? Does it go up by tens? Does it go up by tens?

Where is the arrow?

How long is the line?

What is the temperature? What is the temperature?

What is the temperature?

Reading a graduated cylinder Read from the bottom of the meniscus!

Reading a triple beam balance