DENSITY. D = m/v (g/cm 3 ) Mass usually expressed in grams Volume usually expressed in cm 3 or liters, etc. Density. Density = amount of matter per unit volume Density is the ratio of mass to volume If the volume stays the same and the mass increases . . . the density will increase
D = m/v (g/cm3)
More than “heaviness” - density includes how much space an object takes up!!
All substances have density including liquids, solids, and gasesDensity is the measure of the “compactness” of a material
1. If the glassware is marked every 10 mLs, the volume you record should be in mLs. (Example A)
2. If the glassware is marked every 1 mL, the volume you record should be in tenths of mLs.
3. If the glassware is marked every 0.1 mL, the volume you record should be in hundredths of mLs. (Example B)
the volume you write in your lab report should be 13 mL
Buret marked in 0.1 mL: you record volume as 0.67 mL
High pressure systems indicate a colder more dense air mass that will……. SINK!!!
Denser layers to less dense layers…..
Ice vs. water…..
Wouldn’t you like to have a bunch of THIS dense material?
EX: cubes, cylinders, spheres, cones, etc.
Use a graduated cylinder
Add water to a predetermined level - record.
Gently drop in the irregularly shaped object.
Read the graduated cylinder – record.
Subtract the first water level from the second – this is the volume
SINK or FLOAT
In Water (D = 1.0 g/mL)