DENSITY!!!

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# DENSITY!!! - PowerPoint PPT Presentation

This is NOT DESTINY…. DENSITY!!!. What the heck is Density anyway?. Density is the amount of matter (mass) contained within a given amount of space (volume) There is a formula for this, on the front page of the ESRT! What is this formula? Look at your ESRT!! Hurry up!. Density Formula.

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## PowerPoint Slideshow about 'DENSITY!!!' - bly

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Presentation Transcript
This is NOT DESTINY….

### DENSITY!!!

What the heck is Density anyway?
• Density is the amount of matter (mass) contained within a given amount of space (volume)
• There is a formula for this, on the front page of the ESRT! What is this formula? Look at your ESRT!!
• Hurry up!
Density Formula
• Density = Mass (grams) / Volume (cubic cm or mL)
• D = m/v
• Remember…NO NAKED NUMBERS!
• ALWAYS include units and remember to round to the nearest 10ths
• 4 is not an answer for density
• 4.0 g/cc is an answer!
Formula Manipulations
• You WILL NEED to manipulate this formula in order to solve for Volume and Mass
• If you manipulate this equation, you will get the following *(USE THE DENSITY TRIANGLE!!)
• V = m/d
• M = v x d
• Write these down in your notes!!
Determining the Mass
• Mass is the amount of matter contained within a given object
• It can be measured using an electronic balance or scale
• The proper units to measure MASS in is grams (g)
Determining Volume
• Volume is the amount of space an object occupies
• It can be measured by either by using a ruler to obtain the LENGTH, WIDTH, AND HEIGHT of a rectangular/square object or by using water displacement
• The proper units for volume is cubic centimeters (cc) or milliliters (mL)
Volume of rectangular/square objects

L=?, W=?, H=?

• V= L x W x H
• V = ? cc
• What if this block’s mass is 320 g? What’s its density?
• D = m/v
• d = 320g / ? cc
• D = ? g/cc
Volume of Irregular Objects
• Volumes of irregular objects must be determined by water displacement
• We use a graduated cylinder for this! Let’s see how to do this!!
Water Displacement in 3 steps
• 1) Place a certain amount of water into the graduated cylinder (20mL in this example)
• 2) Place the object into the water CAREFULLY, and record the new water level (it changed to 23mL in this example)
• 3) Now, subtract your old volume from the new volume: 23mL – 20mL = 3mL
• So the volume of this object is 3mL!!!
Volume of a liquid??
• This is MAD easy, yo!
• So, what’s the volume of the water in the graduated cylinder on the left?
• That’s right : 20mL!
Size and Shape
• Size and shape of an object have NO EFFECT on density
• But size and shape DO have an effect on mass and volume!
• Check out this example
• Sample 1: m = 20g and V = 10cc
• D = m/v
• D= 20g / 10cc
• D = 2.0 g/cc
• Sample 2: m = 40g and V=20cc
• D = m/v
• D = 40g / 20cc
• D = 2.0 g/cc
Temperature
• An increase in temperature causes a DECREASE in density!!
• This is because volume increases when heat is applied
Pressure
• An increase in pressure causes an INCREASE in density!!
• This is because as pressure increases on something, its volume decreases!
Earth
• In Earth, more dense materials tend to sink toward the core
• Less dense materials tend to rise to the surface
• Earth’s inner core is MOST dense
• The Outer Atmosphere is LEAST dense (due to VERY light gases there)
Some other interesting tidbits…
• EVERYTHING on this planet is most dense in its SOLID phase…well, almost everything
• WATER is the only exception
• Water is most dense in its LIQUID phase
• Water is most dense at 4 degrees C
• Pure water has a density of 1.0 g/cc
• When putting objects in water, less dense objects will float, more dense will sink, and equal density objects will float right in the middle