Density & Graphing

Density
The density of an object can be expressed through the equation:

d=m/v

Where the 'd' is the density and is found by dividing the mass of an object (m) with it's volume (v).

Density is usually expressed by the units kg/L, kg/m³, or g/cm³.

EXAMPLE: WATER AS A LIQUID HAS IT'S GREATEST DENSITY OF APPROXIMATELY 1000 KG/M³ AT 4˚C AND EVENTUALLY BECOMES LESS DENSE AS THE TEMPERATURE DROPS TO 0˚C. THEREFORE, ICE, HAVING A LOWER TEMPERATURE THAN IT'S LIQUID STATE, WOULD BE LESS DENSE CAUSING IT TO FLOAT ON LIQUID WATER.

VIDEO EXAMPLE: http://www.youtube.com/watch?v=rxb_6UANXqU

Graphing

All graphs must contain 5 aspects:

1.  Labeled axes (y-axis & x-axis)
2. Appropriate scale
3. Title (appropriate for the graph; think of the units for the y-axis & x-axis)
4. Data points
5. A line of best fit (on certain occasions, this line does not have to pass through all the points)

There are 3 things you can do with a graph:

1. Slope (rise/run; y2-y2/x2-x1)
2. Area
3.  Read the Graph

EXAMPLE: THE GRAPH SHOWN ABOVE SHOWS THE RELATION BETWEEN THE NUMBER OF WORDS ONE CAN TYPE  PER MINUTE BASED ON THE WEEKS OF PRACTICE ONE HAS.

*Some of the information and pictures found for this blog was found from the following links; all credits go to these sites:

http://marinebio.org/upload/77/Iceberg.jpg

http://wiki.answers.com/Q/Why_density_if_ice_compared_to_water_in_liquid_state

http://www.aims.co.th/Pretest_GED/Maths/Maths-_5-6.gif