1.4 form 4 density
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Density is defined as mass per unit volume. To determine the density of a liquid, we measure its mass and volume using a measuring cylinder and beam balance. We measure the mass of the empty cylinder and full cylinder to calculate the mass of the liquid, then divide the mass by the volume reading to get density. For a regular solid, we measure length, breadth, height to calculate volume using the formula, and measure mass to then calculate density. An irregular solid's density can be found by either the submersible method using a measuring cylinder, or displacement can method.
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1.4 form 4 density
- 2. Density is defined as mass per unit volume. Density = mass (kg) volume (cm3)
- 3. Expt: Determining the density of a liquid To determine density of a liquid, we need mass and volume. Apparatus: Measuring cylinder Beam balance Procedure: 1. Measure the mass of an empty measuring cylinder and record it as m1 in grams. 2. Pour the given liquid into a measuring cylinder and take the readings in cm3. 3. Measure the mass of the measuring cylinder with water in it and record it as m2 in grams. 4. Calculate the mass of the liquid: Mass of liquid = m2 – m1 5. Calculate the density of the liquid Density of liquid = mass of liquid / volume
- 4. Density of a regular solid To calculate the density of a regular solid, you need mass and volume. The mass of the solid can be measured using a beam balance. The volume of the solid is calculated using the formula: Volume = length x breadth x height V = lbh l h
- 5. Expt: Measuring density of a regular solid Measure the length, breadth and height of the solid block Calculate the volume Measure the mass of the block Calculate the density
- 6. Density of an irregular solid 1. Using submissive method Use a beam balance to measure the mass of a solid. Record it as m. Half-fill a measuring cylinder with water. Measure and record the volume as V1 Carefully lower the irregular solid into the measuring cylinder. The level of the water rises. Record the new volume as V2 Calculate the volume of the solid using: Volume of irregular solid = V2 – V1 Calculate the density of the irregular solid.
- 7. 2. Using a displacement can Arrange the apparatus as shown below. Measure and record the mass of the irregular solid using a balance and record it as m. Lower the solid into the displacement can. The volume of water collected in the displacement can is equivalent to the volume of the solid. Calculate the density of the solid.