Investigating Density
This practical lesson covers:
- How to identify the density of both regular and irregular objects
Investigating the density of regular and irregular objects Aim: To use appropriate apparatus to make and record the measurements needed to determine the densities of regular and irregular solid objects and liquids. |
Background information: Density is a fundamental physical property that describes the mass of a substance per unit volume and is commonly expressed in kilograms per cubic meter (kg/m³). In this practical, you will investigate the densities of both regular and irregular objects. The process involves measuring the mass and volume of each sample and then calculating the density. |
Variables:
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A cuboid object has a mass of 20 g and dimensions 5 cm X 2 cm X 10 cm. Calculate the density of the cuboid in kg/m3.
0.2 kg/m3
0.0002 kg/m3
200000 kg/m3
200 kg/m3
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A digital mass balance read 3 g before the student placed an irregular shaped object on the balance. After the object is placed on the balance it reads 127 g. What is the mass of the object?
130 g
127 g
124 g
it is impossible to say because the balance had a zero error
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Why is the mass of the irregular object measured before placing it in the Eureka can?
when the object is placed in the water, it will get wet and influence the mass reading
it doesn't matter which order you do it as long as both mass and volume are measured
it is quicker
measuring the mass of the object after it has been in the water will result in a mass reading which is too low.
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A student drops the irregular object into the Eureka can. How could they improve the accuracy of this step?
carefully lower the object into the full Eureka can to prevent water splashing out
place the object in the Eureka can and then fill with water to prevent water being spilt
when the object is dropped into the Eureka can, refill it with approximately the right amount of water that was spilt
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