density practicals

Question 1

how to conduct the density practical for regular shaped objects?

Answer 1

1) find mass of an object using a scale
2) take multiple readings for mass and dimensions
3) find the average
4) calculate density

Question 2

how to conduct the density for irregular shaped objects?

Answer 2

1) full eureka can with water just below the spout
2) lower the object into eureka can
3) measure the volume of the displaced water in the measuring cylinder (this is the volume of the object)
4) repeat the measurements and take an average before calculating the density
5) use p=m/v