02_precisionaccuracy

# 02_precisionaccuracy - Lesson 2: Precision and Accuracy In...

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Lesson 2: Precision and Accuracy In everyday language "precise" and "accurate” mean roughly the same thing. .. but not in physics. Precise - after taking a lot of measurements, you notice that they are all very close to each other. Accurate - after taking a lot of measurements, you find they agree with the true value Example 1: You perform an experiment to measure the temperature at which water boils. You set up three containers of water and heat each one. At the instant the water boils you measure the temperature and get the following results: 67 o C 68 o C 68 o C 65 o C 66 o C Notice these values are precise (they are almost the same, they agree with each other), but they are not accurate. They would have to be at about 100°C, the accepted value, to be accurate. Example 2: I ask you to throw five darts at the centre of a dart board. You try three times with the following results. All your darts hit off centre!

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## This note was uploaded on 07/24/2009 for the course PHY 092342 taught by Professor Knott during the Spring '09 term at Cosumnes River College.

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02_precisionaccuracy - Lesson 2: Precision and Accuracy In...

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