Difference between revisions of "Density"
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===About Density=== | ===About Density=== | ||
| − | : An [[object]] with a large amount of [[mass]] in a small [[volume]] is said to have a high [[density]]. | + | : An [[object]] with a large amount of [[mass]] in a small [[Volume (Space)|volume]] is said to have a high [[density]]. |
| − | : An [[object]] with a small amount of [[mass]] spread over a large [[volume]] is said to have a low [[density]]. | + | : An [[object]] with a small amount of [[mass]] spread over a large [[Volume (Space)|volume]] is said to have a low [[density]]. |
: The [[SI Unit|units]] of [[density]] are kg/m<sup>3</sup>. | : The [[SI Unit|units]] of [[density]] are kg/m<sup>3</sup>. | ||
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|[[File:ParticleModelSolidLiquidGas.png|center|500px]] | |[[File:ParticleModelSolidLiquidGas.png|center|500px]] | ||
|- | |- | ||
| − | | style="height:20px; width:200px; text-align:center;" |[[Solid]]s are the most dense [[State of Matter|state of matter]] because there are a large number of [[particle]]s in a certain [[volume]] and [[gas]]es are the least '''dense''' [[State of Matter|state of matter]] because there are a small number of [[particle]]s in a the same [[volume]]. | + | | style="height:20px; width:200px; text-align:center;" |[[Solid]]s are the most dense [[State of Matter|state of matter]] because there are a large number of [[particle]]s in a certain [[Volume (Space)|volume]] and [[gas]]es are the least '''dense''' [[State of Matter|state of matter]] because there are a small number of [[particle]]s in a the same [[Volume (Space)|volume]]. |
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:<math>\rho = \tfrac{m}{V}</math> | :<math>\rho = \tfrac{m}{V}</math> | ||
Where: | Where: | ||
| − | : ρ = density | + | : ρ = [[density]] |
| − | : m = mass | + | : m = [[mass]] |
| − | : V = volume | + | : V = [[Volume (Space)|volume]] |
===Example Calculations=== | ===Example Calculations=== | ||
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[[Mass]] = 5000[[kg]] | [[Mass]] = 5000[[kg]] | ||
| − | [[Volume]] = 0.635m<sup>3</sup> | + | [[Volume (Space)|Volume]] = 0.635m<sup>3</sup> |
:<math>\rho = \tfrac{m}{V}</math> | :<math>\rho = \tfrac{m}{V}</math> | ||
Revision as of 11:06, 1 November 2018
Contents
Key Stage 3
Meaning
Density is the amount of mass per unit volume of an object.
About Density
- An object with a large amount of mass in a small volume is said to have a high density.
- An object with a small amount of mass spread over a large volume is said to have a low density.
- The units of density are kg/m3.
 |
| Solids are the most dense state of matter because there are a large number of particles in a certain volume and gases are the least dense state of matter because there are a small number of particles in a the same volume. |
Density and Floating
- If an object is more dense than water it will sink.
- If an object is less dense than water it will rise through water and float on the surface.
Equation
- Density = Mass/volume
\[\rho = \tfrac{m}{V}\] Where:
Example Calculations
| 5000kg of Iron has a volume of 0.635m2. Calculate the density of Iron. | Text | Text |
|
Volume = 0.635m3 \[\rho = \tfrac{m}{V}\] \[\rho = \tfrac{5000}{0.635}\] \[\rho = 7874kg/m<sup>3</sup>\] |
Text | Text |