Importance of MeasurementAs we discussed in class, measurement is of great importance. We use it as part of every day life! When we get a shirt or dress sown we are employing the physical quantity of length, when we weigh ourselves we are using mass, when we go to the doctor and he uses the thermometer to determine if we have a fever or not, he is checking our temperature. When we check the cinema guide to see the commencing of a movie we are using the physical quantity time. Even when we are baking in the kitchen we need to know how much water or milk to add to our recipes, in this case we are dealing with volume. So from this we can see that measurement is an integral part of our everyday life. Below is the PowerPoint which we have done in class.
Converting Physical QuantitiesIn the previous PowerPoint you were introduced to prefixes which are added to the SI units, these units determine a specific quantity. In this lesson you will be learning how to manipulate these prefixes. For example you would be able to determine how much metres there are in several kilometers as well as converting from Kelvin to degrees Celsius. Attached is the PowerPoint which we will be doing tomorrow. Feel free to read and familarise yourself with the material for tomorrow's class. Also walk with your calculators please!
I have also attached the worksheet which is to be submitted on Wednesday 6th Feb, this will serve as a good revision exercise to help with everything which we have done on Measurements and units and also to help prepare you for your exams at the end of the term Updated: 15th Feb, 2013 @ 12:00 noon
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Instruments used in MeasurementIn the PowerPoint we came across various instruments that we use for measurement. Each physical quantity has a different instrument which is used in its measurement we are familiar with some, however in the Science laboratory, there are more specialized equipment which is used for measuring; as sometimes very small quantities are needed for use.
Length - metre rule, measuring tapes Mass - balances: in the lab we can find analytical balances, double beam balances and triple beam balances. At home we use scales in the kitchen and a bathroom scale to weigh ourselves Volume: measuring cylinders, burettes, pipettes Time: stopwatches, analog and digital clocks , atomic clocks Temperature: thermometers which can be filled with alcohol or mercury and clinical thermometers this is what the doctor uses to determine our temperature. RevisionWe have come to the end of our unit of study on measurements and units, I hope that it has been an enjoyable set of lessons for all of you. From the response in your work sheet I can see that everyone has grasped the concepts exceptionally. Some more work can be done in converting measurements however so I urge everyone to do some more practice questions on this topic and Good Luck!
Remember to read your questions carefully, a lot of students would have obtained full marks if they read the questions carefully! |