Celsius (°C) is a metric unit used to measure temperature. It tells us how hot or cold something is.
Celsius is written with the degree symbol (°) followed by the letter C.
A thermometer is a tool that shows the temperature. On a Celsius thermometer, each line or mark stands for a certain number of degrees.
Most classroom thermometers show each line as 1 °C. Always check what each line stands for before reading.
Some Celsius temperatures are used often in daily life. Recognizing them helps you understand readings quickly.
Think of these as “benchmark” temperatures that you can compare with what you see on a thermometer.
Knowing Celsius helps you understand science, weather, and health information.
If you know what 0 °C, 20 °C, and 100 °C mean, you can guess whether it is cold, warm, or hot in other situations.