Solids, Liquids and Gases
Density & Pressure
Specification -
Notes:
1. Define density and pressure.
Density is the mass per unit volume of a substance. The unit of density is kg/m³
(kilograms per cubic metre).
Pressure is the force acting per unit area and is measured in Pascals (Pa)
2. Write an experiment to investigate the density of a regular object
Measure the mass of the solid using a balance and record the value.
Measure the dimensions of the object (e.g., length, width, height for a cuboid or radius
for a sphere) using a ruler or callipers.
Calculate the volume using the appropriate
Then, calculate the density using the formula.
, Ans:
3.
What are some safety measures the student should consider?
Read measuring instruments at eye level to avoid parallax error
Ensure the ruler/calliper is properly aligned
Take repeated measurements and calculate an average
4. Describe an experiment to determine the density of a liquid. (6 marks)
First, place an empty measuring
cylinder on a balance and record
its mass.
Alternatively, press the tare/zero
button to remove the cylinder's
mass.
Pour a known volume of liquid
into the measuring cylinder.
Record the new mass of the
cylinder and liquid.
Calculate the mass of the liquid
by subtracting the mass of the
empty cylinder (if not tared).
Read the volume directly from the measuring cylinder scale.
Calculate the density using the formula.
5. How can the student obtain accurate results?
Ans: Read the meniscus at eye level to avoid parallax error
Density & Pressure
Specification -
Notes:
1. Define density and pressure.
Density is the mass per unit volume of a substance. The unit of density is kg/m³
(kilograms per cubic metre).
Pressure is the force acting per unit area and is measured in Pascals (Pa)
2. Write an experiment to investigate the density of a regular object
Measure the mass of the solid using a balance and record the value.
Measure the dimensions of the object (e.g., length, width, height for a cuboid or radius
for a sphere) using a ruler or callipers.
Calculate the volume using the appropriate
Then, calculate the density using the formula.
, Ans:
3.
What are some safety measures the student should consider?
Read measuring instruments at eye level to avoid parallax error
Ensure the ruler/calliper is properly aligned
Take repeated measurements and calculate an average
4. Describe an experiment to determine the density of a liquid. (6 marks)
First, place an empty measuring
cylinder on a balance and record
its mass.
Alternatively, press the tare/zero
button to remove the cylinder's
mass.
Pour a known volume of liquid
into the measuring cylinder.
Record the new mass of the
cylinder and liquid.
Calculate the mass of the liquid
by subtracting the mass of the
empty cylinder (if not tared).
Read the volume directly from the measuring cylinder scale.
Calculate the density using the formula.
5. How can the student obtain accurate results?
Ans: Read the meniscus at eye level to avoid parallax error
