What are the common units used for measuring temperature in the Cambridge IGCSE Coordinated Science curriculum?

In the Cambridge IGCSE Coordinated Science curriculum, temperature is commonly measured in degrees Celsius (°C). However, students may also encounter the Kelvin (K) scale, which is the SI unit for temperature. Understanding both units is essential for solving problems related to thermal physics.

How does a thermometer work in measuring temperature?

A thermometer measures temperature by using a substance that changes in a predictable way with temperature changes. For example, in a liquid-in-glass thermometer, the liquid (usually mercury or alcohol) expands or contracts as the temperature rises or falls. This change in volume moves the liquid up or down the scale, allowing us to read the temperature.

What is the difference between Celsius and Kelvin scales in temperature measurement?

The Celsius scale is based on the freezing and boiling points of water, with 0°C as the freezing point and 100°C as the boiling point. The Kelvin scale, used in scientific contexts, starts at absolute zero, the theoretical point where all molecular motion stops, which is 0 K. To convert from Celsius to Kelvin, you add 273.15 to the Celsius temperature.

Why is it important to calibrate a thermometer in thermal physics experiments?

Calibrating a thermometer is crucial to ensure accurate temperature measurements. Calibration involves setting the thermometer to known reference points, such as the freezing and boiling points of water, to correct any discrepancies. This ensures that the readings are reliable, which is essential for conducting precise experiments in thermal physics.

What are some common types of thermometers used in measuring temperature?

Common types of thermometers include liquid-in-glass thermometers, digital thermometers, and infrared thermometers. Liquid-in-glass thermometers use mercury or alcohol, digital thermometers use electronic sensors, and infrared thermometers measure temperature from a distance by detecting infrared radiation. Each type has its specific applications and advantages in different scenarios.

Thermal PhysicsCambridge IGCSE Coordinated Science (0654)

Measurement of Temperature

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next.

Previous Next

Notes & worked examples

Read the notes first. If the method in a worked example clicks, you're ready for the questions.

Page 1 / 0

Study Notes & Exam Tips

The shortest version of this sub-topic — plus the mistakes examiners mark you down for.

Study Notes

Temperature is a measure of how hot or cold an object is, indicating its thermal energy. Thermometers use thermometric properties to measure temperature accurately on the Celsius scale.

Temperature — a measure of how hot or cold an object is. Example: Measured in degrees Celsius or Kelvin.
Thermometer — an instrument that uses a temperature scale to measure temperature. Example: Mercury-in-glass thermometer.
Thermometric Property — a physical property that changes with temperature. Example: Volume of a liquid or electrical resistance.

Exam Tips

Key Definitions to Remember

Temperature: A measure of how hot or cold an object is.
Thermometric Property: A physical property that changes with temperature.

Common Confusions

Confusing temperature with heat.
Misunderstanding the difference between Celsius and Kelvin scales.

Typical Exam Questions

What is a thermometric property? A physical property that changes with temperature.
How does a mercury thermometer work? It measures temperature based on the expansion of mercury.
What are fixed points in temperature measurement? 0°C and 100°C, representing the melting and boiling points of water.

What Examiners Usually Test

Understanding of how different thermometers work.
Ability to explain the concept of fixed points in temperature scales.

Practice questions

Exam-style questions with step-by-step worked solutions. Try one before checking the method.

AI-marked quiz

Get a report showing which sub-topics you've nailed and which ones still need work.