Density

Hey there everyone, it's Maddison... and Ms. Manhart said that we could do a wikispace thing instead of normal homework! sah-weet!Since i'm a internet nerd (according to your friend and mine, ott) I thought, OMGG, maybe I should like.. totally do one! so here it is. and it's on density.. because I couldn't think of anything else. And I know a good amount of stuff about it, so this should be easy. hurrah for laziness. Here it is, anyway. XD

In physical science, density is the quantity of something per unit measure, especially per unit length, area, or volume (you can thank the dictionary for that one). Some objects have a low density, for example a cork, and some have a higher density, like steel. The average calculation to find the density of an object is

(hey thanks, wikipedia!)

If you didn't get that, it's basically Density= Mass/Volume. or density equals the mass divided by the volume. I just felt like being awesome and putting those funky symbols on there. sah-weet.

Okay. now let's see how to get the mass and volume so you can get the fancy equation to get the density. let's say you have a little tiny plastic cube, yeah, like those neato little counter thingies you use in math sometimes. you're trying to get the density. awesome, i know. so you got yer little cuby thing, and to get the volume you do this particular equation. (thanks again, wikipedia!)

If you didn't get THAT, s= the length of the side. You could do base times height times width. That's what I meant. With this particular cube, I happen to know that each side is equal to one centimeter. So you do 1x1x1 which equals................ OH MY GOD! It equals one. And that means it's one cubic centimeter, or 1 cm**³.** Yay! Now we have the volume! Now we have to do the mass. Oh joy.

So to get the mass, it's actully not that hard. You just get your fancy little equal arm balance and place the cube on one end. Hurrah. Then you get you're even more fancy gram mass set and start placing the grams on the side opposite to the one our cube friend is sitting in. When you find the mass, in this case we'll just say one gram, you set up your problem. This is how it should look:

(yay me, i made this one.)

Yay! We have discovered the density of a plastic cube. Phew, that 3rd grade math really wipes you out, doesn't it? Haha! Now we have to do something harder. An irregular shaped object. *dun dun dunnn*

Say you have a rock. Nothing special, no graphite or special metals in it, just a plain, old, blunt, unexciting rock. It's round. Not square. Have you ever seen a perfectly square rock out in the wilderness? I didn't think so. So lets say we have to find the density of this not so great rock. Mass would be easy, just do the equal arm balance dealybobber again, and you'll have the mass. In this case, let's say it's 15 grams. Sweet. Now the not-quite-as-easy-but-still-kinda-easy part. Volume. As I said before, it's a round rock, so doing b*h*w won't work this time. You have to do the evil DISPLACEMENT. It's actully not that hard, haha. Okay, so get your graduated cylinder out and fill it with, oh, let's say, 20 mL of water. After that, you put you're unimaginably boring rock into the cylinder. Then, use your amazing graduated cylinder reading skills to read how much the water rose after the rock was placed inside. Let's say that there is apparently now 40 mL of water inside. So, here's what you do. You take the 40 and subtract 20 from it, which was the first water..number.. thing. Yay. So, if you passed 2nd grade without a failing grade in math, you should have figured out that 40-20= 20. Which means that the volume of the rock is 20 mL. SICCCKKKKK!!!!! XDD Now you set up your fabulous density problem, which looks something like this: (yay, i made it again!)

HOORAY! We succefully found the density of the rock. Maybe he's not so uneventful after all! ^-^ (cute rock by annamasey from photobucket... XD)

So that's density for you. In a nutshell. I really hope this helped, I don't want to be wasting my time, I have a life too you know =P Okay then, see you all later! And if you want to comment, you can email me at defy.gravity2112@gmail.com yay. okbye

this one is courtesy of me. I know you love my models. think of the hearts as molecules...because that's what they are. XP