Second Practice 17/02/11

Practice 2
Density


The mass density or density of a material is defined as its mass per unit volume.The symbol most often used for density is ρ. density is also defined as its weight per unit volume; although, this quantity is more properly called specific weight. Different materials usually have different densities

Objective: obtain the density of different substances using only 10ml of each one

Material:

·         Water

·         Lechera

·         Oil

·         Test tube

Procedure:

1.       Put the test tube in the balance to obtain its mass

2.       Pour in each test tube 10ml of each substance

3.       Put again the test tube in the balance to obtain its mass now that it has the substance

4.       Then substract the mass of the test tube to the obtained mass of the test tube with a substance

5.       Now with the mass and the volume, apply density formule (p=m/v) and calculate the density of each substance  

Results:

·         Water

m= 10g

v= 10ml = 10cm3

ρ= 1g/cm3

·         Oil

m= 9g

v= 10ml = 10cm3

ρ= 0.9g/cm3

·         Lechera

m= 14.9 g

v=10ml = 10cm3

ρ=1.47g/cm3

First Practice 10/02/11

Objective=  know the densitity  of  cubes each one made up of different materials

Materials:

·         Cubes of: wood, cube L, cube E, cube P, cube A

·          balance

Procedure:

1.       Measure each side of the cube

2.       Obtain the volume of each cube

3.       Put the cube in the balance to obtain its mass

4.       After getting the mass applied the formule of density

5.       Obtain the density of each cube

Results:

·         Cube L:

m=11g

v=1.33cm
ρ=8.27 g/cm3

·        
    Cube wood:

m= 0.5g

v= 1cm3
ρ=0.5 g/cm3

·        
     Cube E:

m=13.3g

v= 1.45cm3
ρ= : 9.17 g/cm3

·        
    Cube P:

m=13.9g

v=1.33cm3
ρ=10.45 g/cm3

·        
     Cube A:

m=3.5g

v=1.33cm3
ρ= 2.6 g/cm3

Materials of cubes:
 wood
cupper
steel