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DENSITY!!! - PowerPoint PPT Presentation


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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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what the heck is density anyway
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 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
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
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
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
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
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
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
Volume of a liquid??
  • This is MAD easy, yo!
  • Just pour the liquid into t graduated cylinder and READ!
  • 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
  • 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
Temperature
  • An increase in temperature causes a DECREASE in density!!
  • This is because volume increases when heat is applied
pressure
Pressure
  • An increase in pressure causes an INCREASE in density!!
  • This is because as pressure increases on something, its volume decreases!
earth
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
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