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Density The Amount of Mass in a given Volume

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To find the density of an object we need its Mass, and its Volume. To get the Mass, we use a Triple Beam Balance. (there are other sorts, but this is a nice basic one) BTW – its a delicate instrument – not a toy – treat it gently!!!

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Triple Beam Balance

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Check it first – put all the sliders to zero, and see if it measures zero. (the pointer on the right in the middle of its range – and not moving (or much)) If its not zero – call me…

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Gently place the object you are testing on the pan. Slide the sliders until you get it balanced. Try the heaviest one first! Finish up with the lightest.

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How to Read it! Add up all the values on the sliders

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Now for the Volume From Math class, you know that Volume of a right rectangular solid (box) is L x W x H So, its easy enough – measure them with a meter stick – write down each measurement in cm. (Our Density is going to be in g/cm 3 ) If its a sphere – 4/3 r 3 – so you can measure the diameter and divide by 2

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Do 5 Objects ObjectLength (cm) Width (cm) Height (cm) Volume (cm 3 ) Mass (g) Density (g/cm 3 )

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Mercury Osmium Pumice

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Dead Sea Lots of Salt High Density

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Disclaimer Aloha I put together these power points for use in my science classes. You may use them in your classes. Some images are public domain, some are used under the fair-use provisions of the copyright law, some are mine. Copyright is retained by the owners! Ted Brattstrom

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