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Measurement&Conversions
1. We need a reliable system of measurement to obtain useful data.
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11. Are mass and weight the same? We will compare mass and weight later. However, we measure mass with the same equipment we use to measure weight– a scale or “beam balance”. VB-302-3000 Electronic Precision Balance Scale [Online]. Flex Weigh Direct 2006-07. http://www.flexweighdirect.com/vb3023000/ The mass of this object is 2000 grams.
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15. We use volume measurements everyday. Example: The gas tank in my car contains 15 gallons of gasoline (when it is full). Example: A bread recipe calls for 2 cups of water and 3 tablespoons of oil. In science class, the unit we will use to measure the volumes of liquids is the liter (L) . Think of the amount of space occupied by a 1-liter or 2-liter bottle of soda.
16. The equipment we will use to measure liquid volume in class will be the beaker and the graduated cylinder . Beakers are generally used to measure larger volumes. They do not have many markings. 250 ml Bomex Glass Beaker [Online]. Research Laboratory Supply, Inc. 2008. Researchsupply.net Graduated Cylinder, Glass, 50 ml [Online]. Science Stuff, Inc. 2008. Sciencestuff.com. Graduated cylinders get their name from many small markings (similar to a ruler) that are used to take a wide variety of large and small measurements.
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18. 25 m 2 m 50 m Volume = 2 m x 25 m x 50 m Volume = 2500 m 3 This volume is equivalent to 2500 cubes of 1 m 3 (1 m x 1 m x 1 m)
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