KK.1 Read temperatures on a Celsius thermometer
What is Celsius temperature?
Celsius (°C) is a metric unit used to measure temperature. It tells us how hot or cold something is.
- 0 °C is the temperature when water freezes.
- 100 °C is the temperature when water boils.
- 20 °C is a comfortable room temperature.
Celsius is written with the degree symbol (°) followed by the letter C.
How to read a Celsius thermometer
A thermometer is a tool that shows the temperature. On a Celsius thermometer, each line or mark stands for a certain number of degrees.
- Look at the numbers printed on the thermometer.
- Find the mark where the liquid or red line stops.
- Count the degrees by the marks between the numbers.
- Say the temperature in degrees Celsius (°C).
Most classroom thermometers show each line as 1 °C. Always check what each line stands for before reading.
Identifying common Celsius temperatures
Some Celsius temperatures are used often in daily life. Recognizing them helps you understand readings quickly.
- 0 °C → water freezes (ice forms).
- 10 °C → a cool day outside.
- 20 °C → warm and comfortable indoors.
- 37 °C → normal human body temperature.
- 100 °C → water boils.
Think of these as “benchmark” temperatures that you can compare with what you see on a thermometer.
Using Celsius temperatures in real life
Knowing Celsius helps you understand science, weather, and health information.
- Weather reports may say “It will be 15 °C today.”
- Science experiments often measure in °C.
- A doctor checks if your body temperature is 37 °C.
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.