AQA GCSE Measuring Density

AQA GCSE Measuring Density

Density

Density is the amount of mass per unit volume. 

Formula for density, for Gcse showing different rearrangments and a formula triangle.

Measuring the density of a cuboid, or a regular shaped solid. 

1.Record the mass of the object using a balance

regular solid with mass being recorded on a balance

 

2. Measure the dimensions of the object using  a  ruler, micrometer or vernier callipers

3. Calculate the density using the formula density = mass/volume

Measuring the density of an irregular shaped solid. 

1.Record the mass of the object on a balance

2. Fill a eureka can with water to the spout, place an empty measuring cylinder below the spout. 

Displacement using a eureka can

3. Lower the object carefully into the water.

4. Once the displaced water has stopped flowing into the cylinder, measure the volume of water in the cylinder. Volume of displaced water = volume of object

Displacement experiment  using a eureka can for volume of an irregular solid

5. Calculate density = mass/volume

Measuring the density of a liquid.

Method

1.Record the mass of an empty beaker on a balance

measuring the mass of an empty beaker

2. Take the beaker off of the balance. Use a measuring cylinder to measure a known volume of liquid, then pour the liquid from the cylinder to the beaker. Record the volume for later.

measuring density of a liquid

3. Now the beaker contains the liquid, use the balance to obtain the mass of the beaker an liquid.

mesuring density of a liquid

4. Mass of the liquid can be calculated by subtracting these two masses.

Mass of liquid = 90g-50g = 30g

5. Calculate density = mass/volume

Practice Questions

1.State which of the three methods above you would use to measure the density of a matchbox.

2. State which method you would use above to measure the density of a crystal with sides of different length

3. Billy had a piece of wood which had an irregular shape. He wanted to calculate its density. So, he used the method for an irregular shaped solid. However, his teacher said that his results were not correct. Suggest a reason why his results were not correct. 

 

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