Density+of+Regular+and+Irregular+Shaped+Objects

** Density of Regular and Irregular Shaped Objects **

**__ Density a solid (ex. block) __** ==== Can bricks and wood of the same size and shape have the same density? What if you have ten blocks which are all the same size/ same shape but are made of different materials (i.e. oak, pine, three pieces of PVC, aluminum, copper, steel, brass, and biotite igneous rock ), will the blocks have the same density? ==== ==== In order to determine the relationship that exist between mass and volume and how it affects density, we must first identify what mass and volume means. According to the American Heritage Science Dictionary, Mass is “a measure of the amount of matter contained in or constituting a physical body. ” In other words, mass means how much “stuff” is squished together in a given object. Volume on the other hand is defined as “the amount of space occupied by a three-dimensional object or region of space. ” Now that we know the definition of mass and volume, what do the two concepts have to do with density? Density is “is a measure of the mass of a substance per unit volume ” or in simpler terms, it is how much “stuff” an object has compared to the space it occupies. ====

Materials you will need in in determining the density of solid objects will include a triple beam balance and a ruler.
====Procedure 1) Measure the mass of the 10 blocks given to you by placing each material on a triple beam balance scale; 2) Record all your observations in your notebook. //(Note that the unit of measure often used in mass is in grams---so be sure to write the units you determine for every object)//; 3) Measure the length, width, and height of each of the blocks and record your observation. //(Note that if each of the blocks are exactly the same size and shape in terms of its length, width, and height such that it is a perfect square---you only need to measure one side of the block and multiply it following the formula for determining volume which is length multiplied by width and multiplied by height (L x W x H).// Ex. if the length is 2 cm, you can assume that the width is also 2 cm, and the height is also 2 cm. Therefore L x W x H = 8 cm.) If in the event that you are given blocks of different sizes (ex. small, medium, and large that appear to be perfect squares, then use your ruler to measure each of the blocks one side (it can be any side) and apply the formula for determining the volume of the solid object. ==== ====Now that you have recorded all the mass and volume of each of your blocks, you are now ready to use and apply the formula for density. Ex. mass of the oak block is 3 grams and the volume is 2 cm, the density of oak is 1.5 g/cubic cm. That is how simple it is to determine density of solid (regular) objects! ====

Here is a website that explains the relationship that exist between mass and volume and how the two are used to determine the density of solids in particular blocks: []
 * Fig. 1 Density Blocks **

====In case you cant remember the formula for density and how an object's mass and volume is used in figuring out density...here is a song very much like the tune of the song "Popular" in the broadway musical "Wicked" created by a middle school teacher Mr. Edmonds. (Lyrics are provided at the bottom of the link...enjoy singing to it!)==== media type="youtube" key="TRkCz3zG7w0?version=3" height="349" width="425" **Lyrics** [] ..

Can we use the same formula for finding out densities of solid blocks with different types of liquids? For example if your teacher asks you to find the density of two unknown substances, one looks like its clear tap water and the other one looks blurry and murky, how are you going to determine each of its densities? First thing to do is to determine the mass of the graduated cylinder provided by weighing the empty cylinder on the triple beam balance. Second, fill up the graduated cylinder with an exact amount of the first unknown liquid ex. 50 ml. Note that liquids are mostly measured in liters or milliliters, be sure to mark the appropriate on your record notebook. Third, measure the mass of the graduated cylinder filled with the unknown liquid and get the difference between the measurements of the empty cylinder and the filled up cylinder to get the mass of the unknown liquid. How do you get the difference between the two? you just subtract the two values. Fourth, apply the formula for density (Ex. mass of the empty graduated cylinder is 78 grams, mass of the liquid filled graduated cylinder is 128 grams, there is a difference of 50 grams between the mass of the empty cylinder and the filled up one therefore the mass of unknown liquid is 50. By applying the formula for density, divide the mass of the unknown liquid which is 50 grams with the volume which is 50 ml and voila! You now have the density of the unknown liquid that is 1.0 g/cubic cm.
 * __Density of a liquid __**

 **Figure 2** **Volume of liquids using graduated cylinder**



Here are some websites that will help you further understand the concept of finding the density of solids and liquids.
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And to help you remember how to measure the density of liquids here is another song by Mr. Edmonds with its lyrics. Sing along if you like, it will help you remember density...and that is a promise!
media type="youtube" key="-f5FBvtJ7T0?version=3" height="349" width="425" <span style="font-family: Arial,sans-serif; font-size: 12pt;">**Lyrics** [] <span style="color: black; font-family: Arial,sans-serif; font-size: 12pt;">...


 * <span style="font-family: Arial,sans-serif; font-size: 12pt;">Virtual Density Lab (Solids and liquids) **

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 * <span style="font-family: Arial,sans-serif; font-size: 12pt;">Density Calculator **

Here is an online density calculator which will help you determine the density of objects.
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 * <span style="font-family: Arial,sans-serif; font-size: 12pt;">Density Quiz **

To test your knowledge on density, try to answer the following questions on this link...
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**<span style="font-family: Arial,Helvetica,sans-serif; font-size: 12pt;">References: ** <span style="font-family: Arial,sans-serif; font-size: 12pt;">Density Song Video (n.d.) Retrieved from <span style="background-color: initial; font-family: Arial,sans-serif; font-size: 15px;">[]

<span style="font-family: Arial,sans-serif; font-size: 12pt;">Density of Irregular Objects Song Video (n.d.) Retrieved from []
==== <span style="color: #333333; font-family: Arial,Helvetica,sans-serif; font-size: 12pt;">mass. (n.d.). <span style="font-family: Arial,Helvetica,sans-serif;"> // The American Heritage® Science Dictionary // <span style="color: #333333; font-family: Arial,Helvetica,sans-serif; font-size: 12pt;">. Retrieved June 16, 2011, from Dictionary.com website: <span style="background-color: initial; color: #116699; font-family: Arial,Helvetica,sans-serif; font-size: 12pt;">[] ==== ==== <span style="color: #333333; font-family: Arial,Helvetica,sans-serif; font-size: 12pt;">volume. (n.d.). <span style="font-family: Arial,Helvetica,sans-serif;"> // The American Heritage® Science Dictionary // <span style="color: #333333; font-family: Arial,Helvetica,sans-serif; font-size: 12pt;">. Retrieved June 16, 2011, from Dictionary.com website: <span style="background-color: initial; color: #116699; font-family: Arial,Helvetica,sans-serif; font-size: 12pt;">[] ==== ==== <span style="color: #333333; font-family: Arial,Helvetica,sans-serif;">Density. (n.d.). <span style="font-family: Arial,Helvetica,sans-serif;"> // The American Heritage® Science Dictionary // <span style="color: #333333; font-family: Arial,Helvetica,sans-serif;">. Retrieved June 16, 2011, from Dictionary.com website: <span style="background-color: initial; color: #116699; font-family: Arial,Helvetica,sans-serif; font-size: 10pt;">[] ====

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====<span style="background-color: initial; font-family: Arial,sans-serif; font-size: 15px;">[|method=cResource.dspResourcesForCourse&CourseID=308] ====