The Celsius scale is a temperature scale where water freezes at 0°C and boils at 100°C. It is commonly used in most countries around the world.
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Temperature is measured using thermometers, which can be liquid-in-glass, digital, or infrared. These devices detect temperature by measuring changes in a substance, such as mercury or alcohol, or using sensors.
The common units of temperature are degrees Celsius (°C), degrees Fahrenheit (°F), and Kelvin (K).