Celsius is used to measure temperature in the metric system.
Celsius is represented by the symbol '°C'.
Another name for Celsius is 'centigrade'.
The freezing point of water is 0°C and the boiling point of water is 100°C under a pressure of one standard atmosphere.
The figure shown is a Celsius/Centigrade thermometer and is marked at 10, so the temperature can be written as 10°C.


A. 15°C
B. 55°C
C. 20°C
D. 25°C
Correct Answer: c
Step 1: In the figure, the marked line indicates the temperature.
Step 2: So, the temperature shown using °C is 15°C.
Q1: What is the freezing point of water in Celsius?
Q2: What is the boiling point of water in Celsius at standard atmospheric pressure?
Q: What is the difference between Celsius and centigrade?
A: They are the same thing; Celsius is the modern name for the centigrade scale.
Q: Is Celsius used worldwide?
A: It is the standard temperature scale in most countries except for the United States, where Fahrenheit is more common.