MEasurements.

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Presentation transcript:

MEasurements

Measurements -Quantities that have both a number and a unit -Fundamental to accuracy so it is important to make careful measurements and determine if a measurement is valid. WITHOUT accurate MEASUREMENTS, THE data OBTAINED IN THE LAB WILL BE useless!!

• Making Measurements -In making a measurement, write down all of the measured (exact) digits that the device gives and also one last digit that you estimate -Why would any digits be uncertain? 1) Instruments are not free of error 2) Measuring properly involves some technique

• Estimating Digits -Digital Displays: the final digit on the display is the estimated digit -Scales: With volume the bottom of the liquid surface (meniscus) is where the reading is taken… estimate the last digit *MUST READ THE liquid AT _the bottom FOR AN accurate_ READING IN LAB!! **exception=

Rounding sig figs 5 or greater = round up